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 A027668 #7 Nov 19 2019 05:56:19 %S A027668 2,8,1234,121039421240 %N A027668 Number of independent subsets of nodes of 4^n cube (P_4 X ... X P_4). %Y A027668 Cf. A027624 (P_2), A027667 (P_3). %K A027668 nonn,hard,more %O A027668 0,1 %A A027668 _R. H. Hardin_ %E A027668 a(0) corrected by _Sean A. Irvine_, Nov 16 2019