# A012593 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 6
4 21
5 60
6 285
7 2170
8 12873
9 54936
10 391065
11 4881998
12 33969309
13 28359188
14 826179445
15 48496348290
16 328705747217
17 -5928717037136
18 -26909518872399
19 2320514677184022
20 14213386673919397