OFFSET
0,2
FORMULA
a(n) = Sum_{m>=0} binomial(m*(m-1),n)/2^(m+1). Column sums of A054547.
MAPLE
seq(value(Sum(binomial(m*(m-1), n)/2^(m+1), m=0..infinity)), n=0..20); # Vladeta Jovovic, Aug 25 2006
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Vladeta Jovovic, Aug 22 2006
EXTENSIONS
More terms from Max Alekseyev, Aug 23 2006
STATUS
approved