# A153394 (b-file synthesized from sequence entry) 0 1 1 3 2 18 3 118 4 813 5 5799 6 42470 7 317637 8 2416671 9 18649874 10 145655292 11 1149199212 12 9146686605 13 73354982763 14 592217363334 15 4809250320023 16 39258457746069 17 321964620209940 18 2651536017682988 19 21919266484180533 20 181820251665093357