OFFSET
3,1
COMMENTS
Also column k=2 of A255768. - Omar E. Pol, Jul 26 2015
LINKS
Alois P. Heinz, Table of n, a(n) for n = 3..1000
FORMULA
a(n) = Sum_{k=2..n-1} k * A216665(n,k).
MATHEMATICA
nn=40; ss=Sum[Sum[y^2 x^(i+j)/(1-y x^i)/(1-y x^j), {j, 1, i-1}], {i, 1, nn}]; CoefficientList[Series[D[ss, y]/.y->1, {x, 0, nn}], x]
CROSSREFS
KEYWORD
nonn
AUTHOR
Geoffrey Critzer, Sep 13 2012
STATUS
approved