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A236451 as a simple table

na(n)
1256
22116
32116
417258
525172
617258
7136208
8280436
9280436
10136208
111080984
123081484
134535608
143081484
151080984
168564392
1733804644
1866621676
1966621676
2033804644
218564392
2267897642
23372302304
241010208094
251449135596
261010208094

[256,2116,2116,17258,25172,17258,136208,280436,
 280436,136208,1080984,3081484,4535608,3081484,
 1080984,8564392,33804644,66621676,66621676,
 33804644,8564392,67897642,372302304,1010208094,
 1449135596,1010208094]