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A201954 as a simple table

na(n)
11
20
32
40
524
60
7552
80
915936
100
11427008
120
1335567232
140
157352654592
160
17-1064016089088
180
19-285531029213184
200
21515396596477280256
220
23-177833505179096580096
240
25-286336846462160593059840
260
27573948928392687509387673600
280
29-211350462543692217044652785664

[1,0,2,0,24,0,552,0,15936,0,427008,0,35567232,0,
 7352654592,0,-1064016089088,0,-285531029213184,0,
 515396596477280256,0,-177833505179096580096,0,
 -286336846462160593059840,0,
 573948928392687509387673600,0,
 -211350462543692217044652785664]