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A350972 as a simple table

na(n)
00
11
20
32
40
516
60
7272
80
97936
100
11353792
120
1322368256
140
151903757312
160
17209865342976
180
1929088885112832
200
214951498053124096
220
231015423886506852352
240
25246921480190207983616
260
2770251601603943959887872
280
2923119184187809597841473536
300
318713962757125169296170811392
320

[0,1,0,2,0,16,0,272,0,7936,0,353792,0,22368256,0,
 1903757312,0,209865342976,0,29088885112832,0,
 4951498053124096,0,1015423886506852352,0,
 246921480190207983616,0,70251601603943959887872,0,
 23119184187809597841473536,0,
 8713962757125169296170811392,0]