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A303310 as a simple table

na(n)
15
25
317
436
574
6165
7361
8783
91710
103744
118176
1217851
1339009
1485239
15186206
16406800
17888794
181941803
194242301
209268393
2120249240
2244239542
2396652372
24211161719
25461336399
261007905991
272202025876
284810883806
2910510594448
3022963055655

[5,5,17,36,74,165,361,783,1710,3744,8176,17851,
 39009,85239,186206,406800,888794,1941803,4242301,
 9268393,20249240,44239542,96652372,211161719,
 461336399,1007905991,2202025876,4810883806,
 10510594448,22963055655]