# A012473 (b-file synthesized from sequence entry)
0 1
1 0
2 -1
3 3
4 6
5 -60
6 0
7 2310
8 -10752
9 -84168
10 1152240
11 2453880
12 -154467192
13 797768400
14 16907851688
15 -250017997320
16 -1746679208128
17 77446551835648
18 -318565680255360
19 -18241668233387712
20 262053618149070080