# A025937 (b-file synthesized from sequence entry)
0 1
1 18
2 211
3 2052
4 18025
5 148806
6 1179487
7 9089784
8 68647909
9 510709914
10 3756191803
11 27381204396
12 198197187553
13 1426557620142
14 10220981500759
15 72957382445088
16 519164877763357
17 3684933735388290
18 26099214855723955