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%I #15 Nov 23 2023 15:17:41
%S 2,11,113,4481,425926,116003176,84850904785,169727130490809,
%T 923777353698065520,13700760654444668547510
%N Number of irredundant sets in the grid graph P_n X P_n.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/GridGraph.html">Grid Graph</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/IrredundantSet.html">Irredundant Set</a>
%Y Main diagonal of A286868.
%Y Cf. A286871 (king graph).
%K nonn,more
%O 1,1
%A _Andrew Howroyd_, Aug 02 2017
%E a(10) from _Christian Sievers_, Nov 23 2023