# A331001 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 2
5 8
6 24
7 282
8 888
9 46933
10 238119
11 36027060
12 187011538
13 130162111969
14 1084873972934
15 2200211600730504
16 18559765767843341
17 174907641314142138422
18 2355130982684196593401
19 65250573687646264926302133
20 884112393542714503429381555