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A253377 Number of (3+1)X(n+1) 0..2 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw 1
2500, 22631, 219438, 2000385, 17316309, 128407497, 912012350, 5602735678, 33436453693, 176885943216, 917401073689, 4314850614208, 20011936293206, 85743645410236, 363685859775159, 1446109155724143, 5708063204873431 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A253375

LINKS

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

EXAMPLE

Some solutions for n=2

..1..0..1....2..0..1....0..2..2....2..2..1....1..0..1....2..0..2....2..1..2

..0..2..0....1..0..2....0..2..0....1..0..2....0..0..0....0..0..0....1..1..2

..2..1..2....1..1..1....2..2..2....2..2..2....1..1..2....2..0..2....2..2..2

..1..2..1....1..1..1....0..2..0....1..2..1....0..2..0....0..2..2....2..1..2

CROSSREFS

Sequence in context: A307764 A062120 A220025 * A253370 A204225 A251115

Adjacent sequences:  A253374 A253375 A253376 * A253378 A253379 A253380

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 30 2014

STATUS

approved

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Last modified October 18 17:12 EDT 2019. Contains 328186 sequences. (Running on oeis4.)