# A219358 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 8
4 46
5 334
6 2882
7 28604
8 320248
9 3993184
10 54942740
11 828086732
12 13586200504
13 241294019584
14 4615319816192
15 94629675177320
16 2070911506927360
17 48185049542009248
18 1187816429730925424
19 30923773410431125424
20 847808674826433774928
21 24414218135569507213312