A123367 a(n) = (n! - 2^n)/8, n >= 4.

1, 11, 82, 614, 5008, 45296, 453472, 4989344, 59874688, 778376576, 10897284352, 163459291904, 2615348727808, 44460928495616, 800296713183232, 15205637551038464, 304112751021948928, 6386367771463417856, 140500090972200435712, 3231502092360621031424

Offset

4,2

Links

G. C. Greubel, Table of n, a(n) for n = 4..448

Mathematica

Table[(n!-2^n)/8, {n, 4, 30}] (* Harvey P. Dale, Aug 19 2012 *)

Prog

(PARI) for(n=4, 25, print1((n!-2^n)/8, ", ")) \\ G. C. Greubel, Oct 13 2017
(Magma) [(Factorial(n)-2^n)/8: n in [4..25]]; // G. C. Greubel, Oct 13 2017

Crossrefs

Cf. A123642.

Sequence in context: A211845 A029887 A026871 * A177142 A129388 A030692

Adjacent sequences: A123364 A123365 A123366 * A123368 A123369 A123370

Keyword

nonn

Author

Aminu Alhaji Ibrahim, Oct 12 2006

Extensions

Corrected and extended by Harvey P. Dale, Aug 19 2012

Status

approved