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A256509
a(n) = (n!)! - n! - 1.
1
-1, -1, -1, 713, 620448401733239439359975
OFFSET
0,4
COMMENTS
Term a(5) has 199 decimal digits. - Michael De Vlieger, Mar 31 2015
EXAMPLE
a(3) = (3!)! - 3! - 1 = 720 - 6 - 1 = 713.
MATHEMATICA
Table[(n!)! - n! - 1, {n, 0, 5}] (* Michael De Vlieger, Mar 31 2015 *)
CROSSREFS
Sequence in context: A269060 A265142 A251031 * A259674 A321493 A260282
KEYWORD
sign
AUTHOR
Assoul Abdelkarim, Mar 31 2015
STATUS
approved