# A153988 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 2 4 2 5 4 6 7 7 7 8 19 9 30 10 41 11 111 12 242 13 341 14 1198 15 2798 16 5288 17 19451 18 58386 19 113037 20 552176 21 1717743 22 4407296 23 22107632 24 91701868 25 243757707 26 1626825070 27 6947686128 28 24465641567 29 168345671664 30 954487204861 31 3466462776895