# A074922 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 3
4 28
5 180
6 990
7 5005
8 24024
9 111384
10 503880
11 2238390
12 9806280
13 42493880
14 182530530
15 778439025
16 3300049200
17 13919756400
18 58462976880
19 244639718730
20 1020422356200
21 4244365452600
22 17610393500700
23 72907029092898