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 A178184 #6 Jul 22 2025 08:10:33
%S A178184 4,36,548,16932,1065508,135283236,34495021604,17626681066020,
%T A178184 18032025190548004,36911520172609651236,151152638972001256489508,
%U A178184 1238091191924352276155613732,20283647694843594776223406899748
%N A178184 Sum 2^((k^2+3k)/2) from k=1 to n.
%C A178184 Series of the kind m^((k^2+3k)/2) from k=1 to n was studied by Bernoulli and Euler.
%t A178184 aa = {}; m = 2; sum = 0; Do[sum = sum + m^((n + 3) n/2); AppendTo[aa, sum], {n, 1, 20}]; aa (*Artur Jasinski*)
%t A178184 Accumulate[Table[2^((k^2+3k)/2),{k,20}]] (* _Harvey P. Dale_, Aug 17 2021 *)
%Y A178184 Cf. A178184-A178193.
%K A178184 nonn
%O A178184 1,1
%A A178184 _Artur Jasinski_, May 21 2010