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