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A129949
a(n) = n! - binomial(n,3).
0
1, 1, 2, 5, 20, 110, 700, 5005, 40264, 362796, 3628680, 39916635, 479001380, 6227020514, 87178290836, 1307674367545, 20922789887440, 355687428095320, 6402373705727184, 121645100408831031, 2432902008176638860, 51090942171709438670, 1124000727777607678460
OFFSET
0,3
MATHEMATICA
Table[n! - Binomial[n, 3], {n, 20}] (* David Callan, May 08 2016 *)
CROSSREFS
Sequence in context: A201224 A305922 A019536 * A127065 A168357 A052850
KEYWORD
nonn,easy
AUTHOR
Roger L. Bagula, Jun 10 2007
EXTENSIONS
Edited by Joerg Arndt, Aug 03 2020
STATUS
approved