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 A062812 #11 Mar 24 2019 08:35:40
%S A062812 1,1,5,9,25,65,205,713,2753,11425,50389,234825,1155817,6009153,
%T A062812 32958173,190115849,1148816017,7244099617,47521750501,323632894729,
%U A062812 2284774880441,16702573959489,126299702576365,986688266888777
%N A062812 a(n) = Sum_{i=1..n} i^(n - i) + (-1)^(n - i)*(n - i)^i.
%H A062812 Seiichi Manyama, <a href="/A062812/b062812.txt">Table of n, a(n) for n = 1..600</a>
%t A062812 Sum[i^(n - i) + (-1)^(n - i)*(n - i)^i, {i, 1, n}]
%o A062812 (PARI) a(n) = sum(i=1, n, i^(n-i) + (-1)^(n-i)*(n-i)^i); \\ _Michel Marcus_, Mar 24 2019
%Y A062812 Cf. A062810, A062811.
%K A062812 nonn,easy
%O A062812 1,3
%A A062812 _Olivier Gérard_, Jun 23 2001