|
%I #4 Feb 22 2018 07:16:57
%S 1,18,130,902,6243,43375,300901,2088188,14490885,100561673,697859666,
%T 4842887731,33607835172,233225868721,1618500688831,11231792221332,
%U 77944456338104,540905507962400,3753682843565441,26049161421235915
%N Number of nX3 0..1 arrays with every element equal to 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
%C Column 3 of A299937.
%H R. H. Hardin, <a href="/A299932/b299932.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = 7*a(n-1) +2*a(n-2) -19*a(n-3) +15*a(n-4) +3*a(n-5) -3*a(n-6) -2*a(n-7) -10*a(n-8) -3*a(n-9) +2*a(n-10) for n>11
%e Some solutions for n=5
%e ..0..1..1. .0..0..1. .0..0..0. .0..1..1. .0..0..0. .0..1..0. .0..0..0
%e ..0..1..0. .1..1..0. .0..1..1. .0..0..0. .0..0..0. .1..0..1. .0..0..1
%e ..1..0..1. .1..1..1. .0..0..1. .0..1..0. .0..0..0. .0..0..1. .0..1..1
%e ..0..1..0. .0..1..0. .0..0..0. .1..1..1. .1..0..0. .1..1..0. .1..1..1
%e ..0..0..0. .0..1..0. .0..1..1. .0..0..1. .0..1..1. .1..1..1. .0..0..1
%Y Cf. A299937.
%K nonn
%O 1,2
%A _R. H. Hardin_, Feb 22 2018
| 