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A264702 as a simple table

na(n)
11
23
36
436
5288
62240
720736
8264384
92892672
1063452160
111528823808
1236691771392
13941182156800
1429143203840000
15803229696000000
1636978425856000000

[1,3,6,36,288,2240,20736,264384,2892672,63452160,
 1528823808,36691771392,941182156800,
 29143203840000,803229696000000,36978425856000000]