OFFSET
0,3
EXAMPLE
1 + 4*q + 8*q^2 + 12*q^3 + 16*q^4 + 20*q^5 + 24*q^6 + 28*q^7 + ... / 1 + 4*q + 4*q^2 + 4*q^4 + 8*q^5 + 4*q^8 + 4*q^9 + 8*q^10 + 8*q^13 + ... = 1 + 4*q^2 - 4*q^3 + 12*q^4 - 20*q^5 + 40*q^6 - 68*q^7 + 124*q^8 - 208*q^9 + ...
CROSSREFS
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Feb 21 2003
STATUS
approved