OFFSET
1,3
REFERENCES
George E. Andrews, The Theory of Partitions, Addison-Wesley, Reading, Mass., 1976.
FORMULA
G.f.: Sum((-1)^(k+1)*x^((3*k^2-k)/2)/(1+x^k), k=1..infinity)/Product(1-x^k, k=1..infinity). - Vladeta Jovovic, Dec 20 2004
EXAMPLE
a(5)=3 because the partitions of 5 with nonnegative even ranks are 5 (rank=4), 41 (rank=2) and 311 (rank=0).
CROSSREFS
KEYWORD
nonn
AUTHOR
Emeric Deutsch, Dec 12 2004
EXTENSIONS
More terms, Joerg Arndt, Oct 07 2012
STATUS
approved