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 A098091 #6 Aug 05 2024 11:26:30 %S A098091 1,1,4,7,17,36,88,196,481,1148,2838,7020,17708,44837,114971,296457 %N A098091 Graded dimension of the space of invariant bilinear forms on the free pre-Lie algebra on one generator. %C A098091 The sequence starts at index 5 because the previous terms vanish. %F A098091 It seems that a(n+1) = A000081(n) - A051573(n). - _Andrey Zabolotskiy_, Aug 05 2024 %Y A098091 This is related in some sense to A000081. %Y A098091 Cf. A051573, A123256. %K A098091 nonn,more %O A098091 5,3 %A A098091 _F. Chapoton_, Sep 14 2004