The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #4 Apr 27 2018 09:52:07
%S 1,12,38,148,616,2520,10288,42100,172268,704776,2883500,11797636,
%T 48268920,197487780,808003420,3305872824,13525678764,55339088836,
%U 226414867352,926355911364,3790101263196,15506855855704,63444895485516
%N Number of nX3 0..1 arrays with every element equal to 0, 2, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
%C Column 3 of A303624.
%H R. H. Hardin, <a href="/A303619/b303619.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 5*a(n-1) -5*a(n-2) +8*a(n-3) -12*a(n-4) +4*a(n-5) -4*a(n-6) for n>8
%e Some solutions for n=5
%e ..0..1..1. .0..1..0. .0..0..1. .0..1..1. .0..0..0. .0..0..0. .0..0..0
%e ..1..1..1. .1..1..1. .0..0..1. .0..1..1. .0..0..0. .0..0..0. .0..0..1
%e ..0..1..0. .0..1..1. .1..0..0. .1..1..1. .0..0..1. .1..0..0. .0..0..1
%e ..0..1..1. .1..1..1. .0..0..0. .1..1..0. .1..0..0. .0..0..0. .1..0..0
%e ..1..1..0. .1..1..1. .0..0..1. .1..1..1. .0..0..1. .1..0..1. .0..0..0
%Y Cf. A303624.
%K nonn
%O 1,2
%A _R. H. Hardin_, Apr 27 2018