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 A055309 #14 Sep 08 2022 08:45:01
%S A055309 9,22950,9236700,1731510000,213034536000,20154167953920,
%T A055309 1599866940672000,112412172128256000,7240640845838400000,
%U A055309 437993205197708160000,25315591135036262860800
%N A055309 Number of labeled rooted trees with n nodes and 8 leaves.
%H A055309 Vincenzo Librandi, <a href="/A055309/b055309.txt">Table of n, a(n) for n = 9..200</a>
%H A055309 <a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a>
%F A055309 a(n) = n! * (n-8)^2*(n-7)^2*(n-6)*(n-5)*(n-4)*(n-3)*(n-2)*(n-1)*(9*n^4 - 234*n^3 + 2211*n^2 - 8938*n + 12960)/234101145600. - _Vaclav Kotesovec_, Jul 25 2014
%t A055309 Table[n! * (n-8)^2*(n-7)^2*(n-6)*(n-5)*(n-4)*(n-3)*(n-2)*(n-1)*(9*n^4 - 234*n^3 + 2211*n^2 - 8938*n + 12960)/234101145600,{n,9,20}] (* _Vaclav Kotesovec_, Jul 25 2014 *)
%o A055309 (Magma) [Factorial(n)*(n-8)^2*(n-7)^2*(n-6)*(n-5)*(n-4)*(n-3)*(n-2)*(n-1)*(9*n^4 - 234*n^3 + 2211*n^2 - 8938*n + 12960)/234101145600 : n in [9..25]]; // _Vincenzo Librandi_, Jul 25 2014
%Y A055309 Column 8 of A055302.
%K A055309 nonn
%O A055309 9,1
%A A055309 _Christian G. Bower_, May 11 2000