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A243204 as a simple table

na(n)
01
12
28
335
4160
5752
63605
717544
886400
9429605
102153008
1110860720
1255086421
13280692440
141435868960
157369703660
1637934443008
17195748568256
181012292239955
195244933087000
2027220980100160
21141486701601630
22736387364237280
233837221866576800
2420016901815607125

[1,2,8,35,160,752,3605,17544,86400,429605,2153008,
 10860720,55086421,280692440,1435868960,7369703660,
 37934443008,195748568256,1012292239955,
 5244933087000,27220980100160,141486701601630,
 736387364237280,3837221866576800,
 20016901815607125]