# A199746 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 12
4 66
5 449
6 3678
7 35111
8 383192
9 4704300
10 64172052
11 962908056
12 15762088585
13 279514500434
14 5338014558032
15 109224066408835
16 2383887010044728
17 55281768382909480
18 1357381019671809552
19 35180557115610914376
20 959798458208463538416
21 27494554196938752676656