# A180145 (b-file synthesized from sequence entry) 0 1 1 4 2 16 3 70 4 304 5 1330 6 5812 7 25414 8 111112 9 485818 10 2124124 11 9287278 12 40606576 13 177543394 14 776269636 15 3394069270 16 14839825624 17 64883892490 18 283690631212 19 1240375248574 20 5423269532992 21 23712060090418 22 103675797469204