# A060880 (b-file synthesized from sequence entry)
0 0
1 3
2 23
3 191
4 1727
5 17279
6 207359
7 2903039
8 43545599
9 696729599
10 12541132799
11 250822655999
12 5267275775999
13 115880067071999
14 2781121609727999
15 69528040243199999
16 1807729046323199999
17 48808684250726399999
18 1366643159020339199999