OFFSET
1,2
REFERENCES
N. J. Fine, Basic Hypergeometric Series and Applications, Amer. Math. Soc., 1988; p. 110, Eq. (40.49).
FORMULA
Euler transform of period 10 sequence [ -3, -1, -3, -1, 4, -1, -3, -1, -3, 0, ...].
G.f.: x(Product_{k>0} (1+x^(5k))^6*(1-x^k)/ ((1+x^k)^2*(1-x^(5k)))).
PROG
(PARI) {a(n)=local(A); if(n<1, 0, n--; A=x*O(x^n); polcoeff( eta(x+A)^3*eta(x^10+A)^6/ eta(x^2+A)^2/eta(x^5+A)^7, n))}
CROSSREFS
KEYWORD
sign
AUTHOR
Michael Somos, Nov 10 2005
STATUS
approved