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A217968 as a simple table

na(n)
1243
21523
372257
41602741
548942485
61368783313
740300213599
81170265289539
934202123230555
10997730409895429
1129128167430767449
12850254151548959837
1324820794901995097417
14724574515854245379961
1521151965211624408172993

[243,1523,72257,1602741,48942485,1368783313,
 40300213599,1170265289539,34202123230555,
 997730409895429,29128167430767449,
 850254151548959837,24820794901995097417,
 724574515854245379961,21151965211624408172993]