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A220539 as a simple table

na(n)
11
231
355
4625
52555
617935
790171
8544856
92962859
1017081286
1194990161
12539185536
133022799372
1417066737846
1595943415702
16540694505626
173042529902216
1817135308344664

[1,31,55,625,2555,17935,90171,544856,2962859,
 17081286,94990161,539185536,3022799372,
 17066737846,95943415702,540694505626,
 3042529902216,17135308344664]