A369393 a(n) = 2^n*(((n + 1)/2)^n - n!).

0, 0, 1, 16, 241, 3936, 71569, 1452032, 32724801, 814205440, 22221533401, 661258764288, 21336094568881, 742703018860544, 27764596902369825, 1110071630916222976, 47289995917566900481, 2139290897163297619968, 102449006445196880700841, 5179102933596854288384000, 275667346790825720172556401

Offset

0,4

Links

Table of n, a(n) for n=0..20.

Crossrefs

Cf. A127610, A127426, A368366.

Sequence in context: A175720 A342031 A135518 * A179092 A231020 A274856

Adjacent sequences: A369390 A369391 A369392 * A369394 A369395 A369396

Keyword

nonn,easy

Author

Hugo Pfoertner, Jan 24 2024

Status

approved