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 A291439 #6 Feb 16 2025 08:33:50 %S A291439 1,2,2,2,6,2,4,9,9,4,6,18,32,18,6,8,54,103,103,54,8,13,99,383,590,383, %T A291439 99,13,17,216,1280,2807,2807,1280,216,17,27,512,4247,13138,21555, %U A291439 13138,4247,512,27,40,1079,14354,67564,150063,150063,67564,14354,1079,40 %N A291439 Array read by antidiagonals: T(m,n) = number of maximal irredundant sets in the grid graph P_m X P_n. %H A291439 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GridGraph.html">Grid Graph</a> %H A291439 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MaximalIrredundantSet.html">Maximal Irredundant Set</a> %e A291439 Array begins: %e A291439 ================================================= %e A291439 m\n| 1 2 3 4 5 6 7 %e A291439 ---|--------------------------------------------- %e A291439 1 | 1 2 2 4 6 8 13... %e A291439 2 | 2 6 9 18 54 99 216... %e A291439 3 | 2 9 32 103 383 1280 4247... %e A291439 4 | 4 18 103 590 2807 13138 67564... %e A291439 5 | 6 54 383 2807 21555 150063 1122252... %e A291439 6 | 8 99 1280 13138 150063 1598353 %e A291439 7 | 13 216 4247 67564 1122252 %e A291439 ... %Y A291439 Rows 1-2 are A291055, A291100. %Y A291439 Main diagonal is A290790. %Y A291439 Cf. A286847, A286868. %K A291439 nonn,tabl %O A291439 1,2 %A A291439 _Andrew Howroyd_, Aug 23 2017