A162994 The third left hand column of triangle A162990.

64, 1600, 57600, 2822400, 180633600, 14631321600, 1463132160000, 177038991360000, 25493614755840000, 4308420893736960000, 844450495172444160000, 190001361413799936000000, 48640348521932783616000000, 14057060722838574465024000000

Offset: 3

Author

Johannes W. Meijer, Jul 21 2009

Keywords

• easy
• nonn

Crossrefs

A001044 and A162993 are two other left hand columns.

A002301(n+1) equals the square root of a(n).

Programs

Mathematica

Array[((#+1)!/3)^2 &, 20, 3] (* Paolo Xausa, Apr 01 2024 *)

Formula

a(n) = ((n+1)!/3)^2 for n = 3, 4, 5, ... .

a(n) = A002301(n+1)^2.