A262926 Sum of n consecutive n-th powers starting with n^n.
0, 1, 31, 3408, 873580, 405071029, 295716738515, 312086923732368, 449317984129326216, 846136323944158864793, 2018612200059553898143707, 5949463230586042065279268128, 21227845340442717633531647231668, 90172805592203250075964230466892813
Offset: 0
Examples
a(3) = 3^3 + 4^4 + 5^5 = 3408.
Programs
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Mathematica
Table[Sum[k^k, {k, n, 2 n - 1}], {n, 0, 13}] (* Michael De Vlieger, Oct 05 2015 *) -
PARI
vector(20, n, n--; sum(k=n, 2*n-1, k^k))
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Sage
[sum(k^k for k in (n..2*n-1)) for n in (0..20)] # Bruno Berselli, Oct 05 2015