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A138772 as a simple table

na(n)
10
21
35
427
5168
61200
79720
888200
9887040
109797760
11117936000
121536796800
1321555072000
14323805081600
155187108326400
1688268019840000
171590132031488000
1830233431388160000
19605024315191296000
2012711912992722944000
21279783730940313600000
226437458713635389440000

[0,1,5,27,168,1200,9720,88200,887040,9797760,
 117936000,1536796800,21555072000,323805081600,
 5187108326400,88268019840000,1590132031488000,
 30233431388160000,605024315191296000,
 12711912992722944000,279783730940313600000,
 6437458713635389440000]