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 A367254 #8 Dec 01 2023 04:39:59 %S A367254 1,2,48,2160,143360,12600000,1379524608,180889572864,27638114549760, %T A367254 4822114348846080,945950720000000000,206098414000597966848, %U A367254 49378358320648503164928,12902739286521391316172800,3651796443284936332620595200,1112883434275320000000000000000 %N A367254 a(n) = binomial(2*n - 1, n - 1)*(2*n)^n. %F A367254 a(n) = abs(A137452(2*n, n)). %p A367254 a := n -> binomial(2*n - 1, n - 1)*(2*n)^n; %p A367254 seq(a(n), n = 0..15); %t A367254 A367254[n_]:=If[n==0,1,Binomial[2n-1,n-1](2n)^n]; %t A367254 Array[A367254,20,0] (* _Paolo Xausa_, Dec 01 2023 *) %Y A367254 Cf. A137452. %K A367254 nonn %O A367254 0,2 %A A367254 _Peter Luschny_, Nov 11 2023