A235409 - OEIS

A235409

Number of (n+1)X(4+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise

286, 2302, 20398, 150862, 1155953, 7379380, 48788187, 273307984, 1578043496, 7881635316, 40377942968, 182401018359, 842470282449, 3486469196480, 14723645176175, 56437062063876, 220480959884552, 790014974680676

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OFFSET

1,1

COMMENTS

Column 4 of A235413

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

..1..0..0..0..0....0..0..0..0..0....0..0..1..0..0....0..1..0..1..0

..1..0..1..0..0....0..1..0..0..0....1..0..0..0..1....1..0..1..0..0

..1..1..1..1..0....1..0..0..1..0....1..0..1..0..0....1..1..0..1..0

..1..1..0..1..1....1..1..1..1..0....1..1..0..1..1....0..1..1..0..0

..1..1..1..1..0....1..1..1..1..0....1..1..1..1..0....1..1..1..0..0

CROSSREFS

Sequence in context: A253322 A241616 A204035 * A238251 A027798 A072817

Adjacent sequences: A235406 A235407 A235408 * A235410 A235411 A235412

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2014

STATUS

approved