# A355294 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 14
4 88
5 670
6 6170
7 66360
8 815640
9 11272800
10 173132400
11 2925014400
12 53909394000
13 1076365290000
14 23144112591600
15 533193460800000
16 13102608591072000
17 342105146182800000
18 9457689380931792000
19 275988880808825184000
20 8477631163592791200000
21 273430368958004818560000
22 9238944655686318693120000