login
A178962
Partial sums of A007322.
0
1, 7, 46, 366, 3647, 44205, 630956, 10350572, 191704349, 3954598099, 89888942874, 2231742720730, 60083847852539, 1743321481158041, 54226970410827160, 1800062257926566488, 63512168752599139129, 2373501269897667585631
OFFSET
1,2
FORMULA
a(n) = Sum_{i=1..n} Sum_{r>=0,s>=0} binomial(r*s+i-1,i)/2^(r+s+2).
EXAMPLE
a(3) = 1 + 6 + 39 = 46.
CROSSREFS
Sequence in context: A072948 A332852 A356827 * A203267 A319601 A352693
KEYWORD
nonn
AUTHOR
Jonathan Vos Post, Dec 31 2010
STATUS
approved