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A221271 as a simple table

na(n)
10
216
30
4596
50
624366
70
81001855
90
1041171316
110
121691327788
130
1469470653170
150
162853337539621
170
18117191717993760
190
204813242705044572
210
22197686734633818238
230
248119268451165592095
250

[0,16,0,596,0,24366,0,1001855,0,41171316,0,
 1691327788,0,69470653170,0,2853337539621,0,
 117191717993760,0,4813242705044572,0,
 197686734633818238,0,8119268451165592095,0]