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Row sums of triangle A202917.
4

%I #12 Jul 16 2015 22:09:56

%S 1,2,8,4,132,24,1556,88,5364,168,5612,136,1128168,28656,86804,1672,

%T 3434920,48080,173886368,2462176,4093653652,62126504,4292224444,

%U 10991336,182512332988,4948498616

%N Row sums of triangle A202917.

%C 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).

%Y Cf. A202917, A202941.

%K nonn

%O 0,2

%A _Vladimir Shevelev_ and _Peter J. C. Moses_, Dec 31 2011