# A180665 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 7 4 17 5 47 6 121 7 320 8 835 9 2190 10 5730 11 15006 12 39282 13 102847 14 269252 15 704917 16 1845491 17 4831565 18 12649195 19 33116030 20 86698885 21 226980636 22 594243012 23 1555748412 24 4073002212 25 10663258237 26 27916772486 27 73087059235