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A056423 as a simple table

na(n)
16
215
350
4210
5456
64220
76960
857330
9188810
101518558
113302916
1245916780
1383747280
14933074430
153920355200
1622075393725
1762230996500
18940379117630
191781757016320
2022856963695482
2187052415634120

[6,15,50,210,456,4220,6960,57330,188810,1518558,
 3302916,45916780,83747280,933074430,3920355200,
 22075393725,62230996500,940379117630,
 1781757016320,22856963695482,87052415634120]