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 A363402 #5 Jun 08 2023 08:50:19 %S A363402 0,2,12,56,480,992,4032,16256,261120,784896,1047552,4192256,33546240, %T A363402 67100672,268419072,1073709056,34359214080,17179738112,206157643776, %U A363402 274877382656,2199021158400,4398044413952,17592181850112,70368735789056,1125899839733760,5629499366440960 %N A363402 a(n) = n * (4^n - 2^n) / Clausen(n, 0). %F A363402 a(n) = n * A020522(n) / A160014(n, 0). %p A363402 # Using function 'Clausen' from A160014. %p A363402 a := n -> n * (4^n - 2^n) / Clausen(n, 0): %p A363402 seq(a(n), n = 0..25); %Y A363402 Cf. A160014, A363403, A363395. %K A363402 nonn %O A363402 0,2 %A A363402 _Peter Luschny_, Jun 08 2023