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 A367271 #17 Nov 29 2023 17:22:17 %S A367271 1,2,24,540,17920,787500,43110144,2826399576,215922769920, %T A367271 18836384175180,1847560000000000,201267982422458952, %U A367271 24110526523754151936,3150082833623386551800,445775933018180704665600,67925014299030761718750000,11087976122055526032070410240 %N A367271 a(n) = binomial(2*n, n) * n^n. %H A367271 Michael De Vlieger, <a href="/A367271/b367271.txt">Table of n, a(n) for n = 0..322</a> %F A367271 a(n) = A059297(2*n, n). %F A367271 a(n) ~ 2^(2*n)*n^n/sqrt(n*Pi). - _Stefano Spezia_, Nov 29 2023 %p A367271 seq(binomial(2*n, n) * n^n, n = 0..16); %t A367271 A367271[n_]:=If[n==0,1,Binomial[2n,n]n^n]; %t A367271 Array[A367271,20,0] (* _Paolo Xausa_, Nov 29 2023 *) %Y A367271 Cf. A059297, A293270. %K A367271 nonn %O A367271 0,2 %A A367271 _Peter Luschny_, Nov 11 2023