|
%I #4 Jul 30 2018 11:37:31
%S 8,128,1921,28760,431529,6475106,97158833,1457871738,21875422403,
%T 328241570548,4925277664965,73903984966452,1108932199510127,
%U 16639571244859588,249677420617443179,3746419510986492706
%N Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.
%C Column 4 of A317525.
%H R. H. Hardin, <a href="/A317521/b317521.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 15*a(n-1) +a(n-2) -8*a(n-3) -84*a(n-4) -63*a(n-5) +24*a(n-6) +20*a(n-7)
%e Some solutions for n=5
%e ..0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..1. .0..0..0..0
%e ..0..0..1..0. .0..0..0..1. .1..0..1..1. .1..0..1..1. .0..0..0..0
%e ..1..0..1..1. .0..0..0..1. .1..0..1..0. .1..0..1..1. .1..0..0..1
%e ..0..0..0..0. .1..0..0..1. .0..1..1..1. .0..0..1..0. .1..0..1..0
%e ..1..0..1..1. .0..1..1..0. .0..0..1..0. .1..0..0..0. .1..0..1..1
%Y Cf. A317525.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jul 30 2018
| 