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 A317181 #13 Jul 29 2025 20:04:37 %S A317181 3,15,63,35,128,135,320,63,495,275,231,576,975,99,384,819,1344,455, %T A317181 351,896,1575,2304,143,2975,735,675,1536,2499,495,1280,2295,3456,4655, %U A317181 195,768,1683,2880,4275,5760,1071,2304,935,3591,663,1728,3135,4800,6615,8448,255,2223,5775,10143 %N A317181 Consider primitive integer triangles as listed in rows of table A316842. Sequence gives 16*area^2 for these triangles in the same order. %H A317181 Lars Blomberg, <a href="/A317181/b317181.txt">Table of n, a(n) for n = 1..3000</a> %F A317181 a(n) = 16*s*(s-a)*(s-b)*(s-c) where s = A316852(n)/2, and a,b,c are A316843(n), A316844(n), A316845(n). %Y A317181 Cf. A316842, A316852, A316846, A316847, A316848. %Y A317181 Subsequence of A316853. %K A317181 nonn,easy %O A317181 1,1 %A A317181 _N. J. A. Sloane_, Jul 23 2018