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 A245090 #7 Jul 12 2014 03:43:54 %S A245090 0,1,1,2,8,34,149,672,3078,14232,66278,310408,1460390,6896417, %T A245090 32668860,155166468,738679240,3523549192,16837094932,80580576022, %U A245090 386187326865,1853144445292,8902504243912,42811658101548,206072505914938,992778384676916,4786621055083592 %N A245090 Number of 2n-node rooted identity trees of height n. %H A245090 Alois P. Heinz, <a href="/A245090/b245090.txt">Table of n, a(n) for n = 0..125</a> %F A245090 a(n) = A227819(2n,n). %F A245090 a(n) ~ c * d^n / sqrt(n), where d = 4.9159375028212..., c = 0.025641919495... . - _Vaclav Kotesovec_, Jul 12 2014 %Y A245090 Cf. A227819. %K A245090 nonn %O A245090 0,4 %A A245090 _Alois P. Heinz_, Jul 11 2014