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A153364 as a simple table

na(n)
14
28
314
428
550
6100
7180
8360
9650
101300
112350
124700
138500
1417000
1530750
1661500
17111250
18222500
19402500
20805000
211456250
222912500
235268750
2410537500
2519062500
2638125000
2768968750
28137937500
29249531250
30499062500
31902812500
321805625000

[4,8,14,28,50,100,180,360,650,1300,2350,4700,8500,
 17000,30750,61500,111250,222500,402500,805000,
 1456250,2912500,5268750,10537500,19062500,
 38125000,68968750,137937500,249531250,499062500,
 902812500,1805625000]