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 A211696 #6 May 12 2023 15:32:13 %S A211696 1,2,3,4,5,8,13,20,29,45,73,118,185,294,480,793,1298,2127,3531,5932, %T A211696 9975,16783,28415,48527,83236,143064,246839,428430,747193,1307145, %U A211696 2294023,4043525,7158170,12715501,22656789,40512977,72713331,130948115,236535554 %N A211696 Number of nonnegative integer arrays of length n+2*4-2 with new values introduced in order 0 upwards and every value appearing only in runs of at least 4. %C A211696 Column 4 of A211700. %H A211696 R. H. Hardin, <a href="/A211696/b211696.txt">Table of n, a(n) for n = 1..210</a> %e A211696 All solutions for n=5 %e A211696 ..0....0....0....0....0 %e A211696 ..0....0....0....0....0 %e A211696 ..0....0....0....0....0 %e A211696 ..0....0....0....0....0 %e A211696 ..0....0....0....0....1 %e A211696 ..1....0....0....0....1 %e A211696 ..1....0....1....0....1 %e A211696 ..1....1....1....0....1 %e A211696 ..1....1....1....0....1 %e A211696 ..1....1....1....0....1 %e A211696 ..1....1....1....0....1 %Y A211696 Cf. A211700. %K A211696 nonn %O A211696 1,2 %A A211696 _R. H. Hardin_, Apr 19 2012