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A261964 as a simple table

na(n)
11
21
31
42
54
62
76
856
956
106
1124
121712
139408
141712
1524
16120
1792800
184948992
194948992
2092800
21120
22720
237918592
246085088256
2563352393728
266085088256
277918592
28720
295040
30984237056
3114782316470272
322472100837326848
332472100837326848
3414782316470272
35984237056
365040

[1,1,1,2,4,2,6,56,56,6,24,1712,9408,1712,24,120,
 92800,4948992,4948992,92800,120,720,7918592,
 6085088256,63352393728,6085088256,7918592,720,
 5040,984237056,14782316470272,2472100837326848,
 2472100837326848,14782316470272,984237056,5040]