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 A262431 #6 Sep 22 2015 13:28:51 %S A262431 0,1,0,0,1,1,3,5,11,22,52,115,273,644,1573,3856,9644,24279,61893, %T A262431 158889,411428,1072028,2811609,7413463,19649241,52316944,139894857, %U A262431 375528799,1011716551,2734772854,7415422577,20165386637,54986169227,150314356310,411889718607,1131182969207,3113152753735,8584838194606,23718156038153,65645270386188,181995126904192,505374034237230,1405493236272560,3914493099421124,10917513941356709,30489195461667752,85254349536078343,238677545290333506,668973049906462186,1877097092617714583,5272616851131377907 %N A262431 Number of trees on n vertices with an odd number of leaves. %C A262431 For n>=0, A262430(n) + a(n) = A000055(n). %C A262431 For n>=2, A262430(n) - a(n) = A262395(n). %F A262431 G.f.: (A(x,1)-A(x,-1))/2, where A(x,y) is g.f. for A055290. %Y A262431 Cf. A000055, A055290, A055277, A262430. %K A262431 nonn %O A262431 0,7 %A A262431 _Max Alekseyev_, Sep 22 2015