# A013225 (b-file synthesized from sequence entry)
0 0
1 0
2 -1
3 1
4 -6
5 15
6 -90
7 285
8 -1960
9 2275
10 -20160
11 -739125
12 5484600
13 -142631775
14 978257280
15 -20452770975
16 62899668000
17 -1760322929625
18 -37787340240000
19 438469128896175
20 -27777038217435000
21 392637961158139125