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A055899 as a simple table

na(n)
31
47
531
6101
7272
8636
91340
102600
114725
128135
1313391
1421217
1532536
1648496
1770512
18100296
19139905
20191775
21258775
22344245
23452056
24586652
25753116
26957216
271205477
281505231
291864695
302293025
312800400
323398080
334098496
344915312

[1,7,31,101,272,636,1340,2600,4725,8135,13391,
 21217,32536,48496,70512,100296,139905,191775,
 258775,344245,452056,586652,753116,957216,1205477,
 1505231,1864695,2293025,2800400,3398080,4098496,
 4915312]