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 A286868 #14 Feb 16 2025 08:33:45 %S A286868 2,3,3,5,11,5,9,26,26,9,15,79,113,79,15,26,224,548,548,224,26,44,640, %T A286868 2513,4481,2513,640,44,76,1828,11826,34049,34049,11826,1828,76,130, %U A286868 5225,55136,265227,425926,265227,55136,5225,130 %N A286868 Array read by antidiagonals: T(m,n) = number of irredundant sets in the grid graph P_m X P_n. %H A286868 Andrew Howroyd, <a href="/A286868/b286868.txt">Table of n, a(n) for n = 1..153</a> %H A286868 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GridGraph.html">Grid Graph</a> %H A286868 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/IrredundantSet.html">Irredundant Set</a> %e A286868 Array begins: %e A286868 ============================================================= %e A286868 m\n| 1 2 3 4 5 6 7 %e A286868 ---|--------------------------------------------------------- %e A286868 1 | 2 3 5 9 15 26 44... %e A286868 2 | 3 11 26 79 224 640 1828... %e A286868 3 | 5 26 113 548 2513 11826 55136... %e A286868 4 | 9 79 548 4481 34049 265227 2052725... %e A286868 5 | 15 224 2513 34049 425926 5467052 69724154... %e A286868 6 | 26 640 11826 265227 5467052 116003176 2441933224... %e A286868 7 | 44 1828 55136 2052725 69724154 2441933224 84850904785... %e A286868 ... %Y A286868 Row 1 is A286887. %Y A286868 Main diagonal is A286869. %Y A286868 Cf. A286847 (minimal dominating sets). %Y A286868 Cf. A286870 (king graph). %K A286868 nonn,tabl %O A286868 1,1 %A A286868 _Andrew Howroyd_, Aug 02 2017