cp's OEIS Frontend

A326101 Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%I A326101 #4 Jun 06 2019 07:53:15
%S A326101 8,108,929,8628,81088,760989,7140349,67004116,628759699,5900226292,
%T A326101 55367209521,519561060022,4875515579106,45751412134945,
%U A326101 429327253573823,4028769432048059,37805620308254748,354764637439887326
%N A326101 Number of nX4 0..1 arrays with every element equal to 0, 1, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
%C A326101 Column 4 of A326105.
%H A326101 R. H. Hardin, <a href="/A326101/b326101.txt">Table of n, a(n) for n = 1..210</a>
%F A326101 Empirical: a(n) = 9*a(n-1) +6*a(n-2) -25*a(n-3) +20*a(n-4) +45*a(n-5) -90*a(n-6) -223*a(n-7) -120*a(n-8) -31*a(n-9) +380*a(n-10) +330*a(n-11) -63*a(n-12) +1212*a(n-13) +225*a(n-14) +584*a(n-15) +203*a(n-16) +317*a(n-17) +57*a(n-18) +86*a(n-19) -5*a(n-20) +4*a(n-21) -4*a(n-22)
%e A326101 Some solutions for n=5
%e A326101 ..0..0..1..1. .0..1..0..1. .0..1..0..1. .0..1..0..0. .0..1..1..1
%e A326101 ..1..0..1..0. .0..1..1..1. .0..1..1..0. .0..0..1..0. .0..0..1..0
%e A326101 ..0..1..0..0. .0..0..0..1. .1..0..1..0. .1..0..1..1. .1..1..0..1
%e A326101 ..0..1..1..1. .0..1..1..1. .1..0..1..1. .0..0..0..1. .1..0..1..0
%e A326101 ..1..0..0..0. .0..0..0..0. .0..0..0..0. .1..1..1..1. .0..1..0..0
%Y A326101 Cf. A326105.
%K A326101 nonn
%O A326101 1,1
%A A326101 _R. H. Hardin_, Jun 06 2019