# A006140 (b-file synthesized from sequence entry) 0 1 1 1 2 -2 3 2 4 -2 5 1 6 0 7 1 8 -2 9 0 10 2 11 0 12 -1 13 -2 14 2 15 1 16 0 17 -2 18 2 19 -2