# A019171 (b-file synthesized from sequence entry) 3 0 4 0 5 4 6 4 7 8 8 20 9 48 10 106 11 264 12 580 13 1462 14 3724 15 8604 16 21558 17 55364 18 137162 19 348320 20 900372 21 2325534 22 6063822 23 15903112 24 41844862 25 110699956 26 293478616 27 779292432 28 2075209638 29 5534781586 30 14778464050 31 39525926012