# A068844 (b-file synthesized from sequence entry)
1 11
2 23
3 61
4 241
5 1201
6 7207
7 504001
8 4032029
9 36288017
10 362880043
11 3991680029
12 47900160013
13 622702080047
14 8717829120019
15 130767436800073
16 2092278988800037
17 35568742809600019
18 640237370572800041