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%I #27 Feb 12 2024 08:36:55
%S 0,0,0,3,15,97,597,5098,47746,582342,7691278,125339157,2195109753,
%T 45664819407,1013323126923,26022340062564,709267685968788,
%U 21939269071805596,717007984481424300,26196923530426606903
%N Number of chordless cycles in the n X n black bishop graph.
%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BlackBishopGraph.html">Black Bishop Graph</a>
%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ChordlessCycle.html">Chordless Cycle</a>
%F For n > 1, a(n) = A370224(n) - A303542(n).
%Y Cf. A303542 (white bishop graph), A370224 (bishop graph).
%K nonn,more
%O 1,4
%A _Eric W. Weisstein_, Feb 12 2024