# A005328 (b-file synthesized from sequence entry)
2 1
3 3
4 28
5 510
6 18631
7 1351413
8 194192398
9 55272612720
10 31184369778961
11 34909296450535023
12 77616063417393956368
13 343049603717222441078130
14 3016429354620114423122804491
15 52801416275268069417410827891833