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A053677 as a simple table

na(n)
16
240
3454
42600
52586
620175
748103
893097
9105805
10265195
11755100
12803007
131211000
141111974
151493421
161499160
172622000
184309280
195127195
205574139

[6,40,454,2600,2586,20175,48103,93097,105805,
 265195,755100,803007,1211000,1111974,1493421,
 1499160,2622000,4309280,5127195,5574139]