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 A026505 #12 Oct 04 2019 09:12:11 %S A026505 1,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,20,21,22,24,25,26,28,30, %T A026505 32,33,36,37,38,40,42,45,46,48,50,52,56,57,58,60,66,70,72,73,78,80,85, %U A026505 86,88,93,100,102,105,106,112,120,122,130,133,136,148,150,158,165,168,177,190 %N A026505 a(n) is the least positive integer > a(n-1) and not a(j)*a(k) + a(k)*a(i) + a(i)*a(j) for 1 <= i < j < k <= n. %Y A026505 Cf. A026501, A026502, A026503, A026504, A026506. %K A026505 nonn %O A026505 1,2 %A A026505 _Clark Kimberling_ %E A026505 More terms from _Sean A. Irvine_, Oct 03 2019