OFFSET
1,2
COMMENTS
a(n) = 0 iff n is an odd prime.
MATHEMATICA
Table[Mod[Binomial[2*n - 1, n - 1] - 1, n^2], {n, 1, 100}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Aug 07 2000
STATUS
approved