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A303311 as a simple table

na(n)
18
27
324
450
5139
6349
7853
82180
95525
1013824
1134900
1288161
13221923
14559409
151411020
163556271
178964218
1822600998
1956974213
20143622769
21362071261
22912756908
232300972077
245800604608
2514622927344
2636863258801
2792929626827
28234268970653

[8,7,24,50,139,349,853,2180,5525,13824,34900,
 88161,221923,559409,1411020,3556271,8964218,
 22600998,56974213,143622769,362071261,912756908,
 2300972077,5800604608,14622927344,36863258801,
 92929626827,234268970653]