# A309490 (b-file synthesized from sequence entry)
1 0
2 1
3 6
4 28
5 145
6 876
7 6139
8 49120
9 442089
10 4420900
11 48629911
12 583558944
13 7586266285
14 106207728004
15 1593115920075
16 25489854721216
17 433327530260689
18 7799895544692420
19 148198015349155999
20 2963960306983120000
21 62243166446645520021
22 1369349661826201440484
23 31495042222002633131155
24 755881013328063195147744