# A123306 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 26 5 156 6 1234 7 12340 8 150994 9 2204112 10 37617314 11 738465620 12 16451763834 13 411281292920 14 11427727238034 15 350040470610996 16 11736423864328466 17 428080429306305136 18 16893650334361392866