# A337870 (b-file synthesized from sequence entry)
0 1
1 2
2 16
3 166
4 1934
5 24076
6 312906
7 4191822
8 57433950
9 800740450
10 11319707546
11 161841539812
12 2335765140994
13 33979681977530
14 497696233487200
15 7332776490675630
16 108595186409772174
17 1615573668169487898
18 24132221328987714066