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 A000840 #18 Mar 11 2020 19:01:32 %S A000840 0,0,1,1,2,5,12,31,90,285,938,3285,11983,45390,177803,718390,2986407, %T A000840 12749364,55802982,250068732,1145923828,5363795830,25620207380, %U A000840 124767647097,618983876918,3126035142910,16060182735947,83883575376862,445164927249466,2399098651337048 %N A000840 Number of cubic bicolored graphs on n unlabeled nodes admitting an automorphism exchanging the colors. %Y A000840 Column k=3 of A333159. %Y A000840 Cf. A000512, A000843, A004066, A008325. %K A000840 nonn %O A000840 1,5 %A A000840 _Brendan McKay_ and Eric Rogoyski %E A000840 a(11)-a(30) from _Andrew Howroyd_, Mar 10 2020