# A168948 (b-file synthesized from sequence entry)
0 1
1 31
2 930
3 27900
4 837000
5 25110000
6 753300000
7 22599000000
8 677970000000
9 20339100000000
10 610173000000000
11 18305190000000000
12 549155700000000000
13 16474671000000000000
14 494240130000000000000
15 14827203900000000000000