# A097346 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 24
4 170
5 240
6 2415
7 7000
8 30744
9 45360
10 741510
11 1108800
12 21673080
13 32744712
14 49684635
15 151351200
16 3932288360
17 6028102080
18 176061013128
19 271314186000
20 419047770960
21 648560072160
22 23130491854470
23 35929017476352