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A254254 Number of (n+2)X(2+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
2812, 14681, 59531, 223357, 888391, 3647288, 15380009, 65954108, 284203166, 1230877185, 5342480244, 23208777649, 100906958889, 438856975356, 1908960099543, 8304782737694, 36130959962354, 157196994230935 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A254260

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +9*a(n-2) -12*a(n-3) -105*a(n-4) -35*a(n-5) +376*a(n-6) +453*a(n-7) -295*a(n-8) -1041*a(n-9) -767*a(n-10) +468*a(n-11) +1203*a(n-12) +829*a(n-13) +48*a(n-14) -921*a(n-15) -766*a(n-16) +251*a(n-17) +334*a(n-18) +12*a(n-19) -36*a(n-20) -8*a(n-21) for n>25

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A031551 A031731 A252048 * A254261 A258524 A258531

Adjacent sequences:  A254251 A254252 A254253 * A254255 A254256 A254257

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2015

STATUS

approved

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Last modified September 25 13:37 EDT 2021. Contains 347654 sequences. (Running on oeis4.)