# A013072 (b-file synthesized from sequence entry)
0 0
1 2
2 -1
3 17
4 -54
5 685
6 -4950
7 66265
8 -757400
9 11694805
10 -178921800
11 3236694875
12 -61062375000
13 1283939654075
14 -28563558478000
15 688487451426125
16 -17578710756204000
17 478975365932337625
18 -13780824752845800000