A030563 a(n)=(# 1's)-(# 2's) in first n terms of A030548.
1, 0, 0, 0, 0, 1, 1, 2, 3, 4, 3, 4, 4, 5, 5, 6, 6, 5, 5, 4, 5, 4, 3, 2, 2, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 3, 4, 4, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7, 8, 8, 9, 10, 11
Offset: 1