# A162171 (b-file synthesized from sequence entry)
1 1
2 3
3 6
4 20
5 75
6 336
7 1708
8 9792
9 62325
10 436480
11 3334386
12 27595776
13 245951615
14 2348666880
15 23923317720
16 258910994432
17 2966901358185
18 35886973648896
19 456927138333790
20 6108665873694720
21 85555744482868275
22 1252729007440396288
23 19140289332506060676