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 A178192 #12 Dec 26 2023 10:22:16
%S A178192 121,161172,2358108863,379752191692104,672750374684751701305,
%T A178192 13109994864250305051813161676,2810243697916419649311518955166566527,
%U A178192 6626407610546884801816680266380777080570215568
%N A178192 Sum 11^((k^2+3k)/2) from k=1 to n.
%C A178192 Series of the kind m^((k^2+3k)/2) from k=1 to n was studied by Bernoulli and Euler.
%H A178192 Vincenzo Librandi, <a href="/A178192/b178192.txt">Table of n, a(n) for n = 1..40</a>
%t A178192 aa = {}; m = 11; sum = 0; Do[sum = sum + m^((n + 3) n/2); AppendTo[aa, sum], {n, 1, 20}]; aa (*Artur Jasinski*)
%t A178192 Table[11^((k^2+3k)/2),{k,10}]//Accumulate (* _Harvey P. Dale_, Apr 02 2020 *)
%o A178192 (PARI) a(n) = sum(k=1, n, 11^((k^2+3*k)/2)); \\ _Michel Marcus_, Sep 09 2013
%Y A178192 Cf. A178184-A178193.
%K A178192 nonn
%O A178192 1,1
%A A178192 _Artur Jasinski_, May 21 2010