cp's OEIS Frontend

A231941 Number of 2 X n 0..3 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors.

%I A231941 #6 Dec 26 2023 23:44:51
%S A231941 16,84,668,5070,42104,326010,2511252,19430715,152135920,1190465282,
%T A231941 9289762532,72404777123,564819519982,4409093385085,34418864675001,
%U A231941 268626308705377,2096420912100320,16362151427663928,127710770440282286
%N A231941 Number of 2 X n 0..3 arrays with no element less than a strict majority of its horizontal, diagonal and antidiagonal neighbors.
%C A231941 Row 2 of A231940.
%H A231941 R. H. Hardin, <a href="/A231941/b231941.txt">Table of n, a(n) for n = 1..210</a>
%F A231941 Empirical: a(n) = 16*a(n-1) -86*a(n-2) +190*a(n-3) +319*a(n-4) -4988*a(n-5) +10423*a(n-6) +3869*a(n-7) -14328*a(n-8) +132748*a(n-9) -44748*a(n-10) -130980*a(n-11) -63336*a(n-12) -493560*a(n-13) -373248*a(n-14) -51840*a(n-15).
%e A231941 Some solutions for n=7
%e A231941 ..0..0..0..0..0..2..3....0..0..3..0..1..0..0....0..0..2..2..1..1..2
%e A231941 ..2..0..0..0..3..1..1....0..0..0..0..0..2..0....0..0..1..3..1..1..3
%Y A231941 Cf. A231940.
%K A231941 nonn
%O A231941 1,1
%A A231941 _R. H. Hardin_, Nov 15 2013