# A099152 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 3 4 7 5 23 6 83 7 405 8 2113 9 12657 10 82297 11 596483 12 4698655 13 40071743 14 367854835 15 3622508685 16 38027715185 17 424060091065 18 5006620130753 19 62395131973755 20 818456924866815 21 11271715349614463