A104880 - OEIS

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A104880

Diagonal sums of a sum-of-powers triangle.

%I #3 Mar 30 2012 18:59:06

%S 1,1,2,3,5,8,14,26,53,117,280,721,1989,5844,18188,59652,205305,739041,

%T 2775190,10846975,44039765,185391480,807776210,3637193486,16900721837,

%U 80939650565,399061251260,2023408865997,10540656630133,56362743769012

%N Diagonal sums of a sum-of-powers triangle.

%C Diagonal sums of A104878.

%F a(0)=1, a(1)=1, a(n)=n+sum{k=2..floor(n/2), (k^(n-2k+1)-1)/(k-1)}, n>1.

%K easy,nonn

%O 0,3

%A _Paul Barry_, Mar 28 2005