# A058737 (b-file synthesized from sequence entry) 2 1 3 1 4 3 5 7 6 20 7 55 8 162 9 477 10 1450 11 4446 12 13858 13 43589 14 138515 15 443487 16 1430261 17 4640312 18 15137893 19 49620637 20 163360133 21 539904503 22 1790699059 23 5958280016 24 19883532941 25 66532519727 26 223177199775 27 750340752081 28 2528058240115