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A356766 as a simple table

na(n)
13
26
318
440
5127251
6198
726890623
8918
917298
106640
1125269208984375
123400
133900566650390623
14640062
158418573
1618088
171164385682220458984373
1841650
1969528379848480224609373
20128464
2134084859373
2212164094
23150509919493198394775390625
2490270
25418514293125
2664505245696

[3,6,18,40,127251,198,26890623,918,17298,6640,
 25269208984375,3400,3900566650390623,640062,
 8418573,18088,1164385682220458984373,41650,
 69528379848480224609373,128464,34084859373,
 12164094,150509919493198394775390625,90270,
 418514293125,64505245696]