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 A055293 #11 Mar 07 2022 10:22:31 %S A055293 1,3,9,26,66,158,350,727,1428,2679,4804,8308,13888,22539,35606,54935, %T A055293 82907,122712,178375,255085,359304,499179,684621,927943,1243918, %U A055293 1650519,2169112,2825336,3649246,4676552,5948727,7514406,9429698 %N A055293 Number of trees with n nodes and 6 leaves. %H A055293 Georg Fischer, <a href="/A055293/b055293.txt">Table of n, a(n) for n = 7..250</a> %H A055293 <a href="/index/Tra#trees">Index entries for sequences related to trees</a> %Y A055293 Column 6 of A055290. %K A055293 nonn %O A055293 7,2 %A A055293 _Christian G. Bower_, May 09 2000