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 A369393 #6 Jan 24 2024 10:05:51 %S A369393 0,0,1,16,241,3936,71569,1452032,32724801,814205440,22221533401, %T A369393 661258764288,21336094568881,742703018860544,27764596902369825, %U A369393 1110071630916222976,47289995917566900481,2139290897163297619968,102449006445196880700841,5179102933596854288384000,275667346790825720172556401 %N A369393 a(n) = 2^n*(((n + 1)/2)^n - n!). %Y A369393 Cf. A127610, A127426, A368366. %K A369393 nonn,easy %O A369393 0,4 %A A369393 _Hugo Pfoertner_, Jan 24 2024