# A203618 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 42 5 104 6 120 7 165 8 245 9 272 10 561 11 1806 12 47058 13 765625 14 1137501 15 3874128 16 9131793 17 2214502422 18 52495396602