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A216164 as a simple table

na(n)
14
24
320
4100
5500
65000
750000
8500000
95000000
1050000000
11500000000
125000000000
1350000000000
14500000000000
155000000000000
1650000000000000
17500000000000000
185000000000000000
1950000000000000000
20500000000000000000

[4,4,20,100,500,5000,50000,500000,5000000,
 50000000,500000000,5000000000,50000000000,
 500000000000,5000000000000,50000000000000,
 500000000000000,5000000000000000,
 50000000000000000,500000000000000000]