A139150 a(n) = (n!+3)/3.

3, 9, 41, 241, 1681, 13441, 120961, 1209601, 13305601, 159667201, 2075673601, 29059430401, 435891456001, 6974263296001, 118562476032001, 2134124568576001, 40548366802944001, 810967336058880001

Offset

3,1

Links

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

Example

(2!+3)/3 = 5/3 is not an integer.
a(3) = (3!+3)/3 = 3.

Mathematica

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

Crossrefs

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

Sequence in context: A159039 A074502 A109743 * A360704 A293955 A113271

Adjacent sequences: A139147 A139148 A139149 * A139151 A139152 A139153

Keyword

nonn

Author

Artur Jasinski, Apr 11 2008

Extensions

Name corrected by Amiram Eldar, Oct 13 2024

Status

approved