A368368 AGM transform of squares.

0, 9, 1772, 662544, 458284375, 543682781641, 1033215730131200, 2972173255049281536, 12354182867688591966525, 71417932095699615712890625, 556289577698910589026958125056, 5685963330436142993425055664640000, 74579993174727714813743424870936891459

Offset

1,2

Comments

See A368366 for further information.

Links

Paolo Xausa, Table of n, a(n) for n = 1..160

Mathematica

A368368[n_] := (n*(n+1)*(2*n+1)/6)^n - n^n*n!^2;
Array[A368368, 15] (* Paolo Xausa, Jan 29 2024 *)

Prog

(Python)
from math import factorial
def A368368(n): return (n*(n+1)*((n<<1)+1)//6)**n-n**n*factorial(n)**2 # Chai Wah Wu, Jan 25 2024

Crossrefs

Cf. A368366.

Sequence in context: A251700 A246115 A068182 * A218415 A194135 A114224

Adjacent sequences: A368365 A368366 A368367 * A368369 A368370 A368371

Keyword

nonn

Author

N. J. A. Sloane, Jan 24 2024

Status

approved