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A299875 as a simple table

na(n)
18
229
341
4125
5585
61974
76542
824545
989192
10314259
111128245
124079503
1314634597
1452444291
15188594973
16678001937
172434026544
188742984292
1931418755932
20112865079546
21405419489351
221456549048305
235232786086738
2418798220721187

[8,29,41,125,585,1974,6542,24545,89192,314259,
 1128245,4079503,14634597,52444291,188594973,
 678001937,2434026544,8742984292,31418755932,
 112865079546,405419489351,1456549048305,
 5232786086738,18798220721187]