# A151880 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 1 4 1 5 2 6 3 7 1 8 3 9 9 10 12 11 1 12 4 13 18 14 52 15 60 16 1 17 5 18 30 19 136 20 360 21 360