# A068557 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 1
4 189
5 189
6 12474
7 43659
8 4191264
9 37721376
10 120406632192
11 220745492352
12 974812094226432
13 78959779632340992
14 4421747659411095552
15 1658155372279160832
16 49948354512933617664
17 1519878479474057051897856
18 15633035788876015390949376