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 A014609 #25 Nov 29 2023 13:07:43 %S A014609 1,1,252,756756,11732745024,623360743125120,88832646059788350720, %T A014609 28837919555681211870935040,18975581770994682860770223800320, %U A014609 23183587808948692737291767860055162880,49120458506088132224064306071170476903628800 %N A014609 a(n) = (5n)!/(5!^n). %C A014609 a(n) is also the constant term in product 1 <= i,j <= n, i different from j (1 - x_i/x_j)^5. - Sharon Sela (sharonsela(AT)hotmail.com), Feb 18 2002 %D A014609 G. E. Andrews, R. Askey, and R. Roy, Special Functions, Cambridge University Press, 1998. %H A014609 Alois P. Heinz, <a href="/A014609/b014609.txt">Table of n, a(n) for n = 0..105</a> %H A014609 J.-C. Novelli and J.-Y. Thibon, <a href="http://arxiv.org/abs/1403.5962">Hopf Algebras of m-permutations,(m+1)-ary trees, and m-parking functions</a>, arXiv preprint arXiv:1403.5962 [math.CO], 2014-2020. %o A014609 (PARI) a(n)=if(n<0,0,(5*n)!/120^n) %Y A014609 Cf. A000680, A014606, A014608. %K A014609 nonn %O A014609 0,3 %A A014609 BjornE (mdeans(AT)algonet.se)