# A331610 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 15
4 97
5 777
6 7379
7 80983
8 1007137
9 13986289
10 214383171
11 3593224767
12 65347120705
13 1281151315641
14 26928292883795
15 603928982033863
16 14392387319349697
17 363135896514611041
18 9669298448057196291
19 270932711729869233903
20 7967970654277850949025