# A188224 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 10 4 24 5 54 6 96 7 200 8 442 9 650 10 1548 11 2370 12 4060 13 7670 14 15792 15 25740 16 49074 17 81900 18 147756 19 251012