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 A061788 #16 Jul 01 2018 21:16:43
%S A061788 4,260,46916,16824132,10016824132,8926117272388,11120932942830404,
%T A061788 18457865006652382020,39364865940303189957444,
%U A061788 104896964865940303189957444,341532774329085497699836681028,1334077309624613209946781309524804,6157453657516781924006621069709728580
%N A061788 a(n) = Sum_{k=1..n} (2k)^(2k).
%H A061788 Harry J. Smith, <a href="/A061788/b061788.txt">Table of n, a(n) for n = 1..100</a>
%e A061788 a(3) = 2^2 + 4^4 + 6^6 = 46916.
%t A061788 Accumulate[#^#&/@(2Range[20])] (* _Harvey P. Dale_, May 04 2013 *)
%o A061788 (PARI) { a=n=0; forstep (p=2, 200, 2, write("b061788.txt", n++, " ", a+=p^p) ) } \\ _Harry J. Smith_, Jul 28 2009
%o A061788 (GAP) List([1..13],n->Sum([1..n],k->(2*k)^(2*k))); # _Muniru A Asiru_, Jul 01 2018
%K A061788 nonn,easy
%O A061788 1,1
%A A061788 _Amarnath Murthy_, May 25 2001
%E A061788 More terms from _Jason Earls_, May 26 2001
%E A061788 More terms from _Harvey P. Dale_, May 04 2013