A030618 (# 1's)-(# 2's) in first n terms of A030604.
1, 0, 0, 0, 1, 0, -1, 0, 0, 0, 0, 0, 1, 1, 2, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0, -1, -1, -1, -1, -1, -1, -2, -2, -1, 0, -1, -2, -1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 2, 2, 2, 3, 2, 1, 1, 1, 0, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2
Offset: 1