# A009804 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 2
4 -16
5 -168
6 -928
7 -880
8 57472
9 897792
10 7304192
11 -4100864
12 -1356949504
13 -27044864000
14 -271226560512
15 1097459304448
16 114089524002816
17 2671773715300352
18 29775666324832256
19 -316640482329755648