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A355552 as a simple table

na(n)
15
210
323
454
5117
6240
7497
81006
92027
104074
118169
1216356
1332741
1465506
15131039
16262110
17524253
181048536
192097113
204194262
218388563
2216777170
2333554385
2467108812
25134217677
26268435402
27536870855
281073741766
292147483589
304294967232
318589934529
3217179869118
3334359738299

[5,10,23,54,117,240,497,1006,2027,4074,8169,16356,
 32741,65506,131039,262110,524253,1048536,2097113,
 4194262,8388563,16777170,33554385,67108812,
 134217677,268435402,536870855,1073741766,
 2147483589,4294967232,8589934529,17179869118,
 34359738299]