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A305472 as a simple table

na(n)
01
13
216
3138
41624
524084
6430264
78987376
8214836496
95782610640
10173048646208
115699040103584
12204819346436608
137976556430820544
14334605731401589632
1515041304800209892352
16721313418947271653632
1736756901756710434550528

[1,3,16,138,1624,24084,430264,8987376,214836496,
 5782610640,173048646208,5699040103584,
 204819346436608,7976556430820544,
 334605731401589632,15041304800209892352,
 721313418947271653632,36756901756710434550528]