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A000683 as a simple table

na(n)
10
21
36
440
5360
64576
782656
82122240
977366400
104002843136
11293717546496
1230558458490880
134505780560619520
14941417163728674816
15278628902101315608576
16116805328001281573519360

[0,1,6,40,360,4576,82656,2122240,77366400,
 4002843136,293717546496,30558458490880,
 4505780560619520,941417163728674816,
 278628902101315608576,116805328001281573519360]