Searched every where on web but I couldn't find out the formula for this series.
That's why I am asking here.
I tried following following formula:
$((n*(n+1))/2)^n$
2026-04-09 03:34:16.1775705656
Sum of series: $1^1 + 2^2 + 3^3 + … + n^n$
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The sequence of partial sums is on the OEIS, but no simple formula is listed there, which makes me think no such formula is known.