# A001796 (b-file synthesized from sequence entry) 0 1 1 3 2 27 3 143 4 3315 5 20349 6 260015 7 1710855 8 92116035 9 631165425 10 8775943605 11 61750730457 12 1755702867191 13 12587970424449 14 181858466731095 15 1322239639929719 16 154702037871777123 17 1137023085979691001 18 16789716964765636633