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A255752

Number of (n+2)X(4+2) 0..1 arrays with every 3X3 subblock sum of the medians of the diagonal and antidiagonal minus the two sums of the central row and column nondecreasing horizontally, vertically and ne-to-sw antidiagonally.

30182, 72884, 111064, 118925, 124928, 177281, 306248, 517386, 766616, 1335701, 2994308, 5759584, 8957268, 16979505, 42027004, 83952976, 132161916, 256397865, 651345844, 1313021560, 2072742516, 4044259761, 10340350348, 20890761568

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OFFSET

1,1

COMMENTS

Column 4 of A255756

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) -a(n-2) +21*a(n-4) -42*a(n-5) +21*a(n-6) -84*a(n-8) +168*a(n-9) -84*a(n-10) +64*a(n-12) -128*a(n-13) +64*a(n-14) for n>26

EXAMPLE

Some solutions for n=4

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