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A115598 as a simple table

na(n)
11
28
349
4288
51681
69800
757121
8332928
91940449
1011309768
1165918161
12384199200
132239277041
1413051463048
1576069501249
16443365544448
172584123765441
1815061377048200
1987784138523761
20511643454094368
212982076586042449
2217380816062160328
23101302819786919521

[1,8,49,288,1681,9800,57121,332928,1940449,
 11309768,65918161,384199200,2239277041,
 13051463048,76069501249,443365544448,
 2584123765441,15061377048200,87784138523761,
 511643454094368,2982076586042449,
 17380816062160328,101302819786919521]