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A203269
Row sums of triangle A202917.
4
1, 2, 8, 4, 132, 24, 1556, 88, 5364, 168, 5612, 136, 1128168, 28656, 86804, 1672, 3434920, 48080, 173886368, 2462176, 4093653652, 62126504, 4292224444, 10991336, 182512332988, 4948498616
OFFSET
0,2
COMMENTS
If p is prime, then a(p-1)==2 mod p. At least up to n=251, there is only one nonprime n for which a(n-1)==2 mod n. It is n=18 for which a(18-1)=48080==2(mod 18).
CROSSREFS
Sequence in context: A210422 A085568 A054671 * A011058 A368644 A229981
KEYWORD
nonn
AUTHOR
STATUS
approved