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A074247 as a simple table

na(n)
16
228
3140
4496
52970
68128
727846
8105664
9117800
10237510
11539400
121421280
131539720
142290260
154358600
168872200
1733550336
1850401728
1990409410
20233103780
21287425800
22318177800
23423184320
24559903400
25825120800
261632825792
272705020500
283209343200
293328809120
304720896180

[6,28,140,496,2970,8128,27846,105664,117800,
 237510,539400,1421280,1539720,2290260,4358600,
 8872200,33550336,50401728,90409410,233103780,
 287425800,318177800,423184320,559903400,825120800,
 1632825792,2705020500,3209343200,3328809120,
 4720896180]