A259985 - OEIS

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A259985 - OEIS

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A259985

Triangle read by rows: coefficients of rook polynomials.

3

1, 1, 1, 1, 4, 2, 1, 9, 18, 6, 1, 16, 72, 96, 24, 1, 20, 130, 320, 265, 44, 1, 24, 204, 752, 1185, 672, 80, 1, 28, 294, 1456, 3521, 3892, 1617, 144, 1, 32, 400, 2496, 8264, 14272, 11776, 3776, 264, 1, 36, 522, 3936, 16659, 39924, 52071, 33480, 8577, 484, 1, 40, 660, 5840, 30210, 93568, 171060, 175360, 90745, 19080, 888, 1, 44, 814, 8272, 50677, 193556, 461208, 667832, 554532, 236808, 41745, 1632

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

0,5

LINKS

Table of n, a(n) for n=0..77.

Earl Glen Whitehead, Jr., Four-discordant permutations, J. Austral. Math. Soc. Ser. A 28 (1979), no. 3, 369-377.

Earl Glen Whitehead, Jr., Four-discordant permutations (Table 1) (Annotated scanned table)

EXAMPLE

Triangle begins:

1;

1, 1;

1, 4, 2;

1, 9, 18, 6;

1, 16, 72, 96, 24;

1, 20, 130, 320, 265, 44;

1, 24, 204, 752, 1185, 672, 80;

1, 28, 294, 1456, 3521, 3892, 1617, 144;

1, 32, 400, 2496, 8264, 14272, 11776, 3776, 264;

1, 36, 522, 3936, 16659, 39924, 52071, 33480, 8577, 484;

1, 40, 660, 5840, 30210, 93568, 171060, 175360, 90745, 19080, 888; ...

CROSSREFS

Diagonals give A004306, A005777, A005778.

Sequence in context: A338397 A063983 A367178 * A144084 A021010 A342088

Adjacent sequences: A259982 A259983 A259984 * A259986 A259987 A259988

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Jul 13 2015

STATUS

approved