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 A065086 #8 Jun 11 2017 19:57:07 %S A065086 1,9,126,1920,27190,347168,3990467,42744527,440764556,4464045276, %T A065086 44863859589,449488519847,4498059105204,44992451829730, %U A065086 449969622539954,4499873022468708,44999449703306768,449997540235466340,4499988731927483569,44999947410278947807 %N A065086 Number of n-digit biquanimous numbers in base 10 not allowing leading zeros. %C A065086 A biquanimous number (A064544) is a number whose digits can be split into two groups with equal sums. %D A065086 _William P. Thurston_, personal communication. %e A065086 a(1) = 1 since 0 is the only 1-digit biquam. a(2) = 9 because there are 9 2-digit biquams, namely 11, 22, 33, 44, 55, 66, 77, 88 and 99. %Y A065086 Cf. A064544, A065023, A065025, A065024. %K A065086 nonn,base %O A065086 1,2 %A A065086 _David W. Wilson_, Nov 07 2001