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 A308214 #9 Jun 16 2020 14:30:53
%S A308214 0,0,0,0,0,0,2,0,2,0,5,0,5,7,9,7,9,12,19,12,29,18,35,25,42,38,49,46,
%T A308214 57,54,82,68,98,77,117,97,127,127,148,138,171,169,211,181,246,206,271,
%U A308214 246,298,285,334,325,378,354,437,385,481,423,529,489,574,565
%N A308214 Sum of the smallest side lengths of all integer-sided obtuse triangles with perimeter n.
%H A308214 Wikipedia, <a href="https://en.wikipedia.org/wiki/Integer_triangle">Integer Triangle</a>
%F A308214 a(n) = Sum_{k=1..floor(n/3)} Sum_{i=k..floor((n-k)/2)} (1-sign(floor((i^2 + k^2)/(n-i-k)^2))) * sign(floor((i+k)/(n-i-k+1))) k.
%t A308214 Table[Sum[Sum[k (1 - Sign[Floor[(i^2 + k^2)/(n - i - k)^2]]) Sign[Floor[(i + k)/(n - i - k + 1)]], {i, k, Floor[(n - k)/2]}], {k, Floor[n/3]}], {n, 100}]
%Y A308214 Cf. A308157.
%K A308214 nonn
%O A308214 1,7
%A A308214 _Wesley Ivan Hurt_, May 15 2019