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A297010 as a simple table

na(n)
00
11
22
32
4-8
5-76
6-264
71672
836800
9261648
10-1443680
11-66164704
12-792152448
132482671424
14289529373056
155294082629760
161648955815936
17-2474170098704128
18-65494141255724544
19-303927676523118080
2035926135133071923200
211341060635191667045376

[0,1,2,2,-8,-76,-264,1672,36800,261648,-1443680,
 -66164704,-792152448,2482671424,289529373056,
 5294082629760,1648955815936,-2474170098704128,
 -65494141255724544,-303927676523118080,
 35926135133071923200,1341060635191667045376]