A139153 a(n) = (n!+6)/6.

2, 5, 21, 121, 841, 6721, 60481, 604801, 6652801, 79833601, 1037836801, 14529715201, 217945728001, 3487131648001, 59281238016001, 1067062284288001, 20274183401472001, 405483668029440001, 8515157028618240001

Offset: 3

Author

Artur Jasinski, Apr 11 2008

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 3..450

Crossrefs

Cf. A007749, A020458, A082672, A089085, A089130, A117141, A139056-A139066, A139068, A137390, A139070-A139075, A139148-A139157, A139159, A139160, A139161, A139162.

Programs

Mathematica

Table[(n! + 6)/6, {n, 3, 30}]

Extensions

Name corrected by Amiram Eldar, Oct 14 2024