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A255030 Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the central row and central column minus the two minimums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
2554, 9492, 33778, 87907, 196724, 407885, 794663, 1460513, 2583757, 4473909, 7580232, 12566584, 20578851, 33488585, 53933411, 86021960, 136821479, 217262237, 342983060, 539386487, 849243443, 1336448972, 2095677481 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A255036

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) -a(n-2) -2*a(n-3) +2*a(n-4) -11*a(n-5) +8*a(n-6) +15*a(n-7) -15*a(n-8) +7*a(n-9) +5*a(n-10) -7*a(n-11) -14*a(n-12) -20*a(n-13) +24*a(n-14) +35*a(n-15) -26*a(n-16) -51*a(n-17) +76*a(n-18) +70*a(n-19) -105*a(n-20) -92*a(n-21) +107*a(n-22) +85*a(n-23) -137*a(n-24) -60*a(n-25) +141*a(n-26) +48*a(n-27) -108*a(n-28) -16*a(n-29) +72*a(n-30) -8*a(n-31) -44*a(n-32) +4*a(n-33) +20*a(n-34) -4*a(n-36) for n>42

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A255036

Sequence in context: A185516 A235085 A252685 * A255037 A256948 A202587

Adjacent sequences:  A255027 A255028 A255029 * A255031 A255032 A255033

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 13 2015

STATUS

approved

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Last modified October 24 10:03 EDT 2021. Contains 348225 sequences. (Running on oeis4.)