# A363115 (b-file synthesized from sequence entry)
0 0
1 1
2 1
3 4
4 22
5 168
6 1616
7 18800
8 256432
9 4012288
10 70825344
11 1392214272
12 30157260288
13 713680180224
14 18319344307200
15 506934586748928
16 15043324048398336
17 476540007615725568
18 16050059458251915264
19 572710950848334200832
20 21582629580640554123264
21 856552661738538476765184