# A013231 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 0
4 3
5 -10
6 100
7 -525
8 5565
9 -40500
10 490950
11 -4581775
12 63536275
13 -723857550
14 11365224000
15 -152882218125
16 2687668517625
17 -41677719265000
18 812130983706250
19 -14259432279850875
20 305288364810999375