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A281620 as a simple table

na(n)
21
37
41
567
613
71
8821
9181
1021
111
1212281
132906
14406
1531
161
17217015
1853719
198359
20799
2143
221
234424071
241129899
25188707
2620637
271429
2857
291
30102207817
3126710345
324690249
33561481
3445385
352377
3673
371
382639010709
39701908264
40127951984
4116349374
421469026
4391216
443736
4591
461

[1,7,1,67,13,1,821,181,21,1,12281,2906,406,31,1,
 217015,53719,8359,799,43,1,4424071,1129899,188707,
 20637,1429,57,1,102207817,26710345,4690249,561481,
 45385,2377,73,1,2639010709,701908264,127951984,
 16349374,1469026,91216,3736,91,1]