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A264588 as a simple table

na(n)
11
216
325
4505
53668
630718
7366292
82509523
926091488
10234351923
111992122611
1219022851600
13163598409399
141504760262107
1513600577455859
16120731359424594
171101615290572263
189840525557651890
1988782728901771783
20800828577200616792

[1,16,25,505,3668,30718,366292,2509523,26091488,
 234351923,1992122611,19022851600,163598409399,
 1504760262107,13600577455859,120731359424594,
 1101615290572263,9840525557651890,
 88782728901771783,800828577200616792]