A162991 The first right hand column of triangle A162990.

4, 9, 64, 900, 20736, 705600, 33177600, 2057529600, 162570240000, 15933509222400, 1896219279360000, 269276305858560000, 44970736429301760000, 8724552309817344000000, 1945613940877311344640000

Offset: 1

Author

Johannes W. Meijer, Jul 21 2009

Keywords

• easy
• nonn

Crossrefs

A001048(n) equals the square root of a(n).

A162992 is the second right hand column of triangle A162990.

Programs

Mathematica

Array[((#+1)!/#)^2 &, 20] (* Paolo Xausa, Mar 31 2024 *)

Formula

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