A107028 - OEIS

%I #3 Mar 30 2012 18:59:07

%S 1,3,5,9,19,49,155,591,2651,13689,80009,522193,3762273,29629483,

%T 252966249,2325176147,22874076091,239615657133,2661015200515,

%U 31207545002577,385191232715737,4988767088734625,67615869255979521

%N Row sums of number triangle A107027.

%F a(n)=sum{k=0..n, (n-k-1)C((n-k)*k, k)-(n-k-2)*sum{j=0..k, C((n-k)*k, j)}}

%K easy,nonn

%O 0,2

%A _Paul Barry_, May 09 2005