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 A038121 #21 Sep 08 2022 08:44:53
%S A038121 1,28,630,13860,315315,7567560,192972780,5237832600,151242416325,
%T A038121 4638100767300,150738274937250,5179915266025500,187771928393424375,
%U A038121 7164221267933730000,287080580807915895000,12057384393932467590000
%N A038121 E.g.f.: (1 + 15*x + (45/2)*x^2 + (5/2)*x^3)/(1 - 2*x)^(13/2).
%H A038121 Vincenzo Librandi, <a href="/A038121/b038121.txt">Table of n, a(n) for n = 0..200</a>
%H A038121 Selden Crary, Richard Diehl Martinez, Michael Saunders, <a href="https://arxiv.org/abs/1707.00705">The Nu Class of Low-Degree-Truncated Rational Multifunctions. Ib. Integrals of Matern-correlation functions for all odd-half-integer class parameters</a>, arXiv:1707.00705 [stat.ME], 2017, Table 1.
%F A038121 a(n) = (2n+6)! / (6!*n!*2^n).
%F A038121 n*a(n) - (n+3)*(2*n+5)*a(n-1) = 0. - _R. J. Mathar_, Oct 31 2015
%t A038121 Table[(2n+6)!/(6!*n!*2^n),{n,0,20}] (* _Vincenzo Librandi_, Nov 22 2011 *)
%o A038121 (Magma) [Factorial(2*n+6)/ (720*Factorial(n)*2^n): n in [0..20]]; // _Vincenzo Librandi_, Nov 22 2011
%o A038121 (PARI) x='x+O('x^50); Vec(serlaplace((1+15*x+45/2*x^2+5/2*x^3)/(1-2*x)^(13/2))) \\ _G. C. Greubel_, Aug 13 2017
%Y A038121 Cf. A000457, A001147, A001879, A001880, A001881.
%Y A038121 Column 6 of triangle A001497.
%K A038121 nonn
%O A038121 0,2
%A A038121 _Len Smiley_