# A028226 (b-file synthesized from sequence entry) 0 1 1 38 2 909 3 17518 4 297437 5 4648350 6 68550973 7 968960366 8 13264544733 9 177146894782 10 2320188183677 11 29920806791694 12 381057655784989 13 4803870896957534 14 60058812824159421 15 745739268125744302