A254384 - OEIS

A254384

Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally

3372, 35529, 409051, 4766957, 54712559, 630430184, 7273310228, 83838776143, 966536400371, 11143872854174, 128479354314846, 1481261635497821, 17077855175576714, 196894624081569751, 2270044263780068047

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OFFSET

1,1

COMMENTS

Column 2 of A254390

LINKS

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

FORMULA

Empirical: a(n) = 12*a(n-1) +5*a(n-2) -40*a(n-3) -881*a(n-4) -1730*a(n-5) +14033*a(n-6) +2668*a(n-7) -12716*a(n-8) -91324*a(n-9) +26296*a(n-10) +149802*a(n-11) -8770*a(n-12) +728*a(n-13) -76056*a(n-14) +848640*a(n-15) -1019978*a(n-16) -1367966*a(n-17) +887700*a(n-18) +112840*a(n-19) +2066789*a(n-20) +94674*a(n-21) -1572123*a(n-22) -324304*a(n-23) -1135827*a(n-24) +1289606*a(n-25) +771953*a(n-26) -793926*a(n-27) +108632*a(n-28) +76256*a(n-29) -51808*a(n-30) +4320*a(n-31) +2752*a(n-32) -256*a(n-33)

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Sequence in context: A178506 A248443 A254391 * A253979 A139779 A031626

Adjacent sequences: A254381 A254382 A254383 * A254385 A254386 A254387

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 29 2015

STATUS

approved