|
%I #4 Apr 29 2018 10:52:06
%S 5,5,8,17,36,76,161,349,749,1604,3449,7412,15912,34177,73421,157693,
%T 338696,727505,1562612,3356300,7209009,15484261,33258581,71436052,
%U 153437513,329568260,707879240,1520453249,3265780149,7014565813
%N Number of nX4 0..1 arrays with every element unequal to 0, 1 or 5 king-move adjacent elements, with upper left element zero.
%C Column 4 of A303719.
%H R. H. Hardin, <a href="/A303715/b303715.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = a(n-1) +a(n-2) +3*a(n-3) +a(n-4) -a(n-5) -a(n-6)
%e Some solutions for n=5
%e ..0..0..0..0. .0..0..0..0. .0..1..0..0. .0..0..1..0. .0..0..0..0
%e ..0..0..0..0. .1..0..0..1. .0..0..0..0. .0..0..0..0. .0..0..0..0
%e ..1..0..0..1. .0..0..0..0. .0..0..0..0. .0..0..0..0. .0..0..0..1
%e ..0..0..0..0. .0..0..0..0. .0..0..0..1. .0..0..0..0. .1..0..0..0
%e ..0..0..0..0. .0..0..1..0. .0..0..0..0. .0..1..0..0. .0..0..0..0
%Y Cf. A303719.
%K nonn
%O 1,1
%A _R. H. Hardin_, Apr 29 2018
|
