# A158900 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 20
4 116
5 756
6 5448
7 43032
8 370704
9 3472656
10 35303424
11 388786176
12 4628774016
13 59431077504
14 820503839232
15 12140411779584
16 191844739736064
17 3226219598338560
18 57540789020021760
19 1084906603389864960