# A333890 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 13
4 74
5 556
6 5369
7 64000
8 917235
9 15450781
10 300882997
11 6682784998
12 167423745058
13 4687321410460
14 145487540598936
15 4972006889998672
16 185965612590706251
17 7572297055379416985
18 334097417273761302271
19 15905277840810391655517
20 813931037149014145154401