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A254085 Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1

%I #4 Jan 25 2015 10:27:35

%S 512,3436,22728,148004,977192,6446656,42580424,281186200,1857372144,

%T 12268544428,81040372600,535313103052,3536037360504,23357456516908,

%U 154288871288536,1019162914084204,6732132852099864,44469447874930540

%N Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal maximum nondecreasing horizontally, vertically and ne-to-sw antidiagonally

%C Column 1 of A254092

%H R. H. Hardin, <a href="/A254085/b254085.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 6*a(n-1) +7*a(n-2) -18*a(n-3) +14*a(n-4) -156*a(n-5) -116*a(n-6) +72*a(n-7) +32*a(n-8) +96*a(n-9) +64*a(n-10) for n>17

%e Some solutions for n=4

%e ..0..0..1....0..1..1....0..1..1....0..0..1....0..0..1....0..0..1....1..0..0

%e ..1..0..1....0..0..0....0..0..0....0..1..0....1..0..1....1..0..0....1..1..1

%e ..0..0..0....1..0..1....1..1..0....1..1..0....1..1..1....1..1..0....1..1..0

%e ..1..0..1....0..0..0....1..0..1....1..0..0....0..0..0....0..1..0....1..1..0

%e ..0..1..0....0..0..1....1..0..1....0..0..0....0..1..0....1..0..1....1..0..0

%e ..1..0..1....1..0..1....1..0..1....0..0..0....0..0..1....0..0..0....0..1..1

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 25 2015

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)