# A115087 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 21 4 102 5 579 6 3601 7 24426 8 176858 9 1359906 10 10996740 11 93136545 12 821734072 13 7529402477 14 71404315785 15 699210393923 16 7053151126260 17 73158494370744 18 778922147312076 19 8500606925203992 20 94961268583354364 21 1084632255967292304