This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A061787 #23 Jul 16 2022 12:54:43
%S A061787 1,28,3153,826696,388247185,285699917796,303160806510049,
%T A061787 438197051187369424,827678458937524133601,1979247334119251113257580,
%U A061787 5844566265720101772494382001,20886312566113632136127527292568
%N A061787 a(n) = Sum_{k=1..n} (2k-1)^(2k-1).
%H A061787 Harry J. Smith, <a href="/A061787/b061787.txt">Table of n, a(n) for n = 1..100</a>
%F A061787 a(n) ~ exp(-1) * 2^(2*n-1) * n^(2*n-1). - _Vaclav Kotesovec_, Dec 09 2021
%e A061787 a(3) = 1 + 3^3 + 5^5 = 3153.
%t A061787 Array[Sum[(2 k - 1)^(2 k - 1), {k, #}] &, 12] (* _Michael De Vlieger_, Jul 01 2018 *)
%t A061787 Accumulate[#^#&/@Range[1,25,2]] (* _Harvey P. Dale_, Jul 16 2022 *)
%o A061787 (PARI) { a=n=0; forstep (p=1, 200, 2, write("b061787.txt", n++, " ", a+=p^p) ) } \\ _Harry J. Smith_, Jul 28 2009
%o A061787 (GAP) List([1..13],n->Sum([1..n],k->(2*k-1)^(2*k-1))); # _Muniru A Asiru_, Jul 01 2018
%Y A061787 Partial sums of A085529.
%K A061787 nonn,easy
%O A061787 1,2
%A A061787 _Amarnath Murthy_, May 25 2001
%E A061787 Corrected and extended by _Jason Earls_, May 27 2001