A251485 - OEIS

A251485

Number of (n+1) X (2+1) 0..3 arrays with no 2 X 2 subblock having the sum of its diagonal elements less than the minimum of its antidiagonal elements.

3456, 186304, 10046784, 541815424, 29219848960, 1575813859456, 84982973330688, 4583095819732736, 247164420634563840, 13329472755050099712, 718852832815666617344, 38767429496362104931840, 2090711090157985348366336

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OFFSET

1,1

COMMENTS

Column 2 of A251491.

LINKS

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

FORMULA

Empirical: a(n) = 64*a(n-1) -556*a(n-2) +704*a(n-3) -356*a(n-4) -3968*a(n-5) +36*a(n-6) +1152*a(n-7).

EXAMPLE

Some solutions for n=2

..2..1..0....0..1..2....0..2..3....1..2..3....1..1..1....1..1..2....1..3..0