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A192262
G.f. Sum_{n >= 0} q^(4*n^2)/(q;q^2)_{2n}.
0
1, 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 6, 6, 6, 8, 8, 9, 11, 12, 13, 15, 17, 18, 21, 23, 25, 29, 31, 34, 38, 41, 46, 51, 55, 60, 66, 72, 78, 86, 93, 101, 111, 120, 130, 141, 153, 166, 180, 194, 210, 227, 245, 265, 286, 308
OFFSET
0,8
LINKS
Alexander E. Patkowski, A note on the rank parity function, Discrete Math. 310 (2010), 961-965. See Eq. 3.2.
MAPLE
P:=n->mul((1-q^(2*i+1)), i=0..2*n-1);
t5:=add(q^(4*n^2)/P(n), n=0..60);
t6:=series(t5, q, 60);
seriestolist(%);
CROSSREFS
Cf. A003475.
Sequence in context: A053264 A343347 A079440 * A026414 A353090 A077219
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 27 2011
STATUS
approved