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A028407 as a simple table

n a(n)
1 4
2 12
3 44
4 344
5 33328
6 58616531552
7 263752837930654539573558624
8 5521060336920386409400918079935910963482577804036340308751264 

[4,12,44,344,33328,58616531552,
 263752837930654539573558624,
 55210603369203864094009180799359109634825778040363\
 40308751264]

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Last modified September 16 15:55 EDT 2024. Contains 375976 sequences. (Running on oeis4.)