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 A245091 #9 Mar 09 2015 22:39:16 %S A245091 1,0,0,2,12,61,301,1460,7019,33628,160934,770109,3686706,17661288, %T A245091 84675601,406319271,1951428049,9380072046,45124798445,217252113080, %U A245091 1046731684143,5046754081095,24348794377704,117547968556766,567818803946292,2744396907325759 %N A245091 Number of (2n+1)-node rooted identity trees of height n. %H A245091 Alois P. Heinz, <a href="/A245091/b245091.txt">Table of n, a(n) for n = 0..300</a> %F A245091 a(n) = A227819(2n+1,n). %F A245091 a(n) ~ c * d^n / sqrt(n), where d = 4.9159375028212... (same as for A245090), c = 0.076188269997... . - _Vaclav Kotesovec_, Jul 12 2014 %Y A245091 Cf. A227819. %K A245091 nonn %O A245091 0,4 %A A245091 _Alois P. Heinz_, Jul 11 2014