# A079750 (b-file synthesized from sequence entry)
3 0
4 4
5 25
6 156
7 1099
8 8800
9 79209
10 792100
11 8713111
12 104557344
13 1359245485
14 19029436804
15 285441552075
16 4567064833216
17 77640102164689
18 1397521838964420
19 26552914940323999
20 531058298806480000
21 11152224274936080021