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 A375857 #17 Sep 02 2024 22:46:31 %S A375857 2,3,4,5,7,8,10,9,11,13,14,15,17,16,18,19,21,22,23,24,25,26,27,28,29, %T A375857 30,31,32,33,34,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53, %U A375857 54,55,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,73,74 %N A375857 Left border of triangle A375761. %H A375857 Rémy Sigrist, <a href="/A375857/a375857.gp.txt">PARI program</a> %F A375857 a(n) = A375761(n, 1). %e A375857 a(5) = A375761(5, 1) = 7. %o A375857 (PARI) \\ See Links section. %Y A375857 Cf. A035311, A375761, A375846. %K A375857 nonn %O A375857 1,1 %A A375857 _Rémy Sigrist_, Sep 01 2024