# A297198 (b-file synthesized from sequence entry)
0 1
1 3
2 9
3 30
4 120
5 579
6 3282
7 21375
8 157365
9 1292667
10 11722416
11 116327220
12 1253939835
13 14590810566
14 182283001623
15 2433550353915
16 34576093637625
17 520923897031368
18 8295262714384764
19 139214574513959445