# A004377 (b-file synthesized from sequence entry)
9 1
10 70
11 2926
12 95284
13 2672670
14 67910864
15 1609344100
16 36227890512
17 784244450262
18 16466440817750
19 337429331439200
20 6779606178721740
21 134025863244159796
22 2614066792211961240
23 50410336514571953200