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A254259 Number of (n+2)X(7+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
4351908, 52034327, 240716320, 197326142, 742483152, 1249946456, 3756830312, 14833693096, 43837197480, 151675299240, 570693507496, 2008409942440, 7196492523944, 27787520567720, 104832812624296, 392237057943976 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A254260

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) -6*a(n-2) -208*a(n-4) +240*a(n-5) +1248*a(n-6) -2816*a(n-7) +5120*a(n-8) +512*a(n-9) +57344*a(n-10) -290816*a(n-11) -229376*a(n-12) +851968*a(n-13) +2228224*a(n-14) -524288*a(n-15) -10485760*a(n-16) +8388608*a(n-17) for n>25

EXAMPLE

Some solutions for n=1

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

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

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

CROSSREFS

Sequence in context: A210403 A263155 A254266 * A254305 A237537 A276323

Adjacent sequences:  A254256 A254257 A254258 * A254260 A254261 A254262

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2015

STATUS

approved

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Last modified December 6 20:22 EST 2021. Contains 349567 sequences. (Running on oeis4.)