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A254256 Number of (n+2)X(4+2) 0..1 arrays with every 3X3 subblock sum of the two maximums of the diagonal and antidiagonal minus the sum of the minimums of the central row and column nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
54236, 382316, 1420232, 2983064, 9308828, 29231312, 98883824, 378114160, 1430424048, 5564609520, 22419252720, 89479351792, 365633863152, 1485445045744, 6116672970224, 25031814192624, 103567256034800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A254260

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +20*a(n-2) +20*a(n-3) -104*a(n-4) -608*a(n-5) +160*a(n-6) +1792*a(n-7) +5888*a(n-8) -5120*a(n-9) -8192*a(n-10) -18432*a(n-11) +24576*a(n-12) for n>18

EXAMPLE

Some solutions for n=1

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

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

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

CROSSREFS

Sequence in context: A224625 A224618 A254263 * A254302 A202315 A270763

Adjacent sequences:  A254253 A254254 A254255 * A254257 A254258 A254259

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2015

STATUS

approved

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Last modified October 25 11:29 EDT 2021. Contains 348251 sequences. (Running on oeis4.)