# A335287 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 12
5 30
6 168
7 210
8 420
9 840
10 9240
11 83160
12 120120
13 5165160
14 26860680
15 277560360
16 569729160
17 16522145640
18 33044291280
19 563462139240
20 1140028049160
21 1255683068640
22 65361608151840
23 299761858075680
24 413956851628320