A162112 - OEIS

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A162112 - OEIS

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A162112

Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 4 ones in any row or column.

0

2, 4, 9, 56, 448, 5011, 63524, 940806, 15802494, 298218835, 6312264280, 147191591208, 3769342916158, 105162700003508

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..14.

CROSSREFS

Sequence in context: A204428 A162111 A241600 * A162113 A162114 A162115

Adjacent sequences: A162109 A162110 A162111 * A162113 A162114 A162115

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 25 2009

STATUS

approved