# A056229 (b-file synthesized from sequence entry)
1 1
2 1
3 0
4 -4
5 64
6 -240
7 -2656
8 15360
9 -88064
10 -1714176
11 -28506112
12 59061248
13 1975595008
14 -107448238080
15 858018086912
16 12209125720064
17 61138306793472
18 -297002777247744
19 -7586668200067072
20 309144292445913088