This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A229389 #6 Jul 23 2025 05:42:29 %S A229389 560,68672,5212236,345788172,22494002188,1451228983308,93250181644300, %T A229389 5979900142878732,383094040360124428,24530192376561401868, %U A229389 1570321873470780080140,100513065865910817914892 %N A229389 Number of nX5 0..3 arrays of the sum of the corresponding element, the element to the east and the element to the south in a larger (n+1)X6 0..1 array. %C A229389 Column 5 of A229392 %H A229389 R. H. Hardin, <a href="/A229389/b229389.txt">Table of n, a(n) for n = 1..139</a> %F A229389 Empirical: a(n) = 101*a(n-1) -2532*a(n-2) +10624*a(n-3) -8192*a(n-4) for n>7 %e A229389 Some solutions for n=2 %e A229389 ..3..2..1..3..2....2..2..2..1..2....2..3..2..2..1....2..2..2..0..1 %e A229389 ..3..1..1..1..2....2..3..2..1..1....2..2..1..1..0....1..2..1..0..1 %K A229389 nonn %O A229389 1,1 %A A229389 _R. H. Hardin_ Sep 21 2013