A162993 The second left hand column of triangle A162990.

9, 144, 3600, 129600, 6350400, 406425600, 32920473600, 3292047360000, 398337730560000, 57360633200640000, 9693947010908160000, 1900013614137999360000, 427503063181049856000000, 109440784174348763136000000, 31628386626386792546304000000

Offset: 2

Author

Johannes W. Meijer, Jul 21 2009

Keywords

• easy
• nonn

Crossrefs

A001044 and A162994 are two other left hand columns.

A001710(n+1) equals the square root of a(n).

Programs

Mathematica

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

Formula

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

a(n) = A001710(n+1)^2.