OFFSET
0,9
LINKS
H. L. Alder and A. A. Muwafi, Identities relating the number of partitions into an even and odd number of parts, Fibonacci Quarterly, 13 (1975), 147-149.
FORMULA
G.f.: Product_{n>0} ((1-q^(6*n))/(1+q^n)).
EXAMPLE
There are 10 partitions of 6 where parts occur at most five times: 6, 5+1, 4+2, 4+1+1, 3+3, 3+2+1, 3+1+1+1, 2+2+2, 2+2+1+1, 2+1+1+1+1, and so a(6) = 0.
CROSSREFS
KEYWORD
sign
AUTHOR
Jeremy Lovejoy, Aug 04 2020
STATUS
approved