# A013230 (b-file synthesized from sequence entry)
0 0
1 0
2 -1
3 1
4 -6
5 15
6 -150
7 705
8 -8120
9 56315
10 -750960
11 7042275
12 -106939800
13 1270108125
14 -21672530880
15 312137314125
16 -5928695604000
17 100366159008375
18 -2104970646729600
19 40921600563449775