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 A211695 #6 Jun 02 2025 07:47:52 %S A211695 1,2,3,4,7,12,19,33,59,102,182,334,608,1121,2109,3979,7564,14581, %T A211695 28292,55245,108972,216521,432839,872163,1769716,3612292,7422748, %U A211695 15351002,31928839,66803627,140592917,297492390,632896835,1353709480,2910262905 %N A211695 Number of nonnegative integer arrays of length n+2*3-2 with new values introduced in order 0 upwards and every value appearing only in runs of at least 3. %C A211695 Column 3 of A211700 %H A211695 R. H. Hardin, <a href="/A211695/b211695.txt">Table of n, a(n) for n = 1..210</a> %e A211695 All solutions for n=5 %e A211695 ..0....0....0....0....0....0....0 %e A211695 ..0....0....0....0....0....0....0 %e A211695 ..0....0....0....0....0....0....0 %e A211695 ..1....1....0....0....0....1....0 %e A211695 ..1....1....0....0....0....1....1 %e A211695 ..1....1....0....0....1....1....1 %e A211695 ..1....0....0....1....1....2....1 %e A211695 ..1....0....0....1....1....2....1 %e A211695 ..1....0....0....1....1....2....1 %K A211695 nonn %O A211695 1,2 %A A211695 _R. H. Hardin_ Apr 19 2012