# A063778 (b-file synthesized from sequence entry) 1 3 2 6 3 15 4 36 5 225 6 561 7 1225 8 11935 9 11781 10 27405 11 220780 12 203841 13 3368925 14 4921840 15 7316001 16 33631521 17 142629201 18 879207616 19 1383958576 20 3800798001 21 12524486976 22 181285005825 23 118037679760 24 239764947345 25 738541591425 26 1289707733601 27 1559439365121