# A013158 (b-file synthesized from sequence entry)
0 0
1 2
2 -1
3 20
4 -54
5 940
6 -5670
7 101440
8 -1011080
9 19618000
10 -276748200
11 5948856800
12 -108391285200
13 2598850748000
14 -57723908897200
15 1543071734672000
16 -40212272774544000
17 1193617208821024000