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A127987 as a simple table

na(n)
12
25
313
413
5151
629
75167
8541
951913
10691
1139918847
121520653
139631
142748457
15171793
1637698720637
17429056005099
1810201231
194759011791767
2026573
21560275276313059
2230130171848761
23522781919969
248912567718641664241
25480631246386037
263215985920374841
274561301027

[2,5,13,13,151,29,5167,541,51913,691,39918847,
 1520653,9631,2748457,171793,37698720637,
 429056005099,10201231,4759011791767,26573,
 560275276313059,30130171848761,522781919969,
 8912567718641664241,480631246386037,
 3215985920374841,4561301027]