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 A067897 #15 Mar 17 2021 02:54:52
%S A067897 0,0,0,0,2,8,32,112,412,1504,5760,22464,91224,379424,1632896,7201472,
%T A067897 32709136,152094976,725810176,3540883968,17680145184,90115509888,
%U A067897 469094763008,2489169367808,13465672180160,74161734785536
%N A067897 a(n) = A000085(n) - (1 + Sum_{j=1..n-1} A000085(j)).
%F A067897 a(n) = A000085(n) - A245176(n-1). - _Jon E. Schoenfield_, Mar 14 2021
%e A067897 a(5) = A000085(5) - (1 + Sum_{j=1..4} A000085(j)) = 26 - (1 + 1 + 2 + 4 + 10) = 26 - 18 = 8. - _Jon E. Schoenfield_, Mar 14 2021
%Y A067897 Cf. A000085, A245176.
%K A067897 nonn
%O A067897 0,5
%A A067897 _Ian Mooney_, May 15 2003
%E A067897 Missing initial 0 term added by _Jon E. Schoenfield_, Mar 16 2021