A256669 a(n) = (n!)! - n! - n.
0, -1, -2, 711, 620448401733239439359972
Offset: 0
Keywords
Examples
For n=3, a(3) = (3!)!-3!-3 = 6!-6-3 = 720-9 = 711.
Crossrefs
Cf. A256509.
Programs
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Magma
[Factorial(Factorial(n))-Factorial(n)-n: n in [0..5]]; // Vincenzo Librandi, Apr 08 2015
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Maple
A256669:=n->(n!)!-n!-n: seq(A256669(n), n=0..5); # Wesley Ivan Hurt, Apr 14 2015
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Mathematica
Table[(n!)! - n! - n, {n, 5}] (* Michael De Vlieger, Apr 07 2015 *) -
Sage
[factorial(factorial(n))-factorial(n)-n for n in [0..6]] # Bruno Berselli, Apr 08 2015
Comments