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 A110971 #12 Nov 21 2018 02:37:35 %S A110971 1,1,1,1,2,1,1,2,4,1,1,2,6,6,1,1,2,7,11,10,1,1,2,8,14,24,14,1,1,2,9, %T A110971 16,35,42,22,1,1,2,10,18,45,68,81,30,1,1,2,11,20,55,89,149,138,46,1,1, %U A110971 2,12,22,66,110,216,282,250,62,1,1,2,13,24,78,132,285,422,577,419 %N A110971 Triangle T(n,k) (n >= 2, 1 <= k <= n-1) read by rows: row n gives epispectrum of a path P_n (see reference for precise definition). %H A110971 Toufik Mansour, Armend Sh. Shabani, <a href="https://doi.org/10.3906/mat-1803-113">Bargraphs in bargraphs</a>, Turkish Journal of Mathematics (2018) Vol. 42, Issue 5, 2763-2773. %H A110971 M. A. Michels and U. Knauer, <a href="http://dx.doi.org/10.1016/j.disc.2008.11.022">The congruence classes of paths and cycles</a>, Discr. Math., 309 (2009), 5352-5359. %e A110971 Triangle begins: %e A110971 1; %e A110971 1, 1; %e A110971 1, 2, 1; %e A110971 1, 2, 4, 1; %e A110971 1, 2, 6, 6, 1; %e A110971 1, 2, 7, 11, 10, 1; %e A110971 1, 2, 8, 14, 24, 14, 1; %e A110971 1, 2, 9, 16, 35, 42, 22, 1; %e A110971 1, 2, 10, 18, 45, 68, 81, 30, 1; %e A110971 1, 2, 11, 20, 55, 89, 149, 138, 46, 1; %e A110971 1, 2, 12, 22, 66, 110, 216, 282, 250, 62, 1; %e A110971 1, 2, 13, 24, 78, 132, 285, 422, 577, 419, 94, 1; %e A110971 1, 2, 14, 26, 91, 156, 364, 568, 945, 1070, 732, 126, 1; %Y A110971 Cf. A152086, A102699. %K A110971 nonn,tabl %O A110971 2,5 %A A110971 _N. J. A. Sloane_, Sep 20 2009