OFFSET
0,3
EXAMPLE
a(3) = 21 because 21*3!! + 1 = 21*3+1 = 64 = 4^3.
MATHEMATICA
a={}; Do[k = 2; While[ !IntegerQ[(k^n - 1)/n!!], k++ ]; AppendTo[a, (k^n-1)/n!!], {n, 0, 14}]; a
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Dec 19 2011
STATUS
approved