A153181 Number of overpartitions of n with even rank minus the number of overpartitions of n with odd rank.

1, 2, -4, 8, -10, 8, -8, 16, -20, 10, -8, 24, -24, 8, -16, 32, -26, 16, -12, 24, -40, 16, -8, 48, -40, 10, -24, 32, -32, 24, -16, 48, -52, 16, -16, 48, -50, 8, -24, 64, -40, 32, -16, 24, -72, 24, -16, 80, -56, 18, -28

Offset

0,2

Links

Table of n, a(n) for n=0..50.

K. Bringmann and J. Lovejoy, Overpartitions and class numbers of binary quadratic forms

Formula

G.f: 1 + 2Sum_{n >= 1} q^(n(n+1)/2)/((1+q)(1+q^2)...(1+q^n)^2).

Crossrefs

Sequence in context: A294369 A302907 A319561 * A256624 A247324 A043706

Adjacent sequences: A153178 A153179 A153180 * A153182 A153183 A153184

Keyword

sign

Author

Jeremy Lovejoy, Dec 20 2008

Status

approved