A203269 Row sums of triangle A202917.

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).

Links

Table of n, a(n) for n=0..25.

Crossrefs

Cf. A202917, A202941.

Sequence in context: A210422 A085568 A054671 * A011058 A368644 A229981

Adjacent sequences: A203266 A203267 A203268 * A203270 A203271 A203272

Keyword

nonn

Author

Vladimir Shevelev and Peter J. C. Moses, Dec 31 2011

Status

approved