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A375796 as a simple table

na(n)
01
11
22
36
436
5240
61800
715960
8164640
91905120
1024343200
11342619200
125269017600
1387749101440
141573083832320
1530218175187200
16619256461824000
1713483023576422400
18310821905134540800
197563477205380096000
20193736838233562624000
215210638309494858240000

[1,1,2,6,36,240,1800,15960,164640,1905120,
 24343200,342619200,5269017600,87749101440,
 1573083832320,30218175187200,619256461824000,
 13483023576422400,310821905134540800,
 7563477205380096000,193736838233562624000,
 5210638309494858240000]