# A369510 (b-file synthesized from sequence entry)
0 1
1 4
2 28
3 240
4 2288
5 23296
6 248064
7 2728704
8 30764800
9 353633280
10 4128783360
11 48827351040
12 583674642432
13 7041154416640
14 85610725769216
15 1048040981594112
16 12907157115568128
17 159802897621319680
18 1987875305403187200
19 24833149969036738560
20 311409431144819589120