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A137737 as a simple table

na(n)
10
21
30
430
50
613560
70
827785520
90
10162030637440
110
122156625389318400
130
1456857271240920550400
150
162686506065987036477184000
170
18211180868835057744408834048000
190
2026072812428113877344085395644416000
210

[0,1,0,30,0,13560,0,27785520,0,162030637440,0,
 2156625389318400,0,56857271240920550400,0,
 2686506065987036477184000,0,
 211180868835057744408834048000,0,
 26072812428113877344085395644416000,0]