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 A278613 #17 Jan 19 2019 04:15:43 %S A278613 3,8,21,55,145,381,1001,2633,6921,18193,47833,125745,330569,869057, %T A278613 2284665,6006193,15789865,41510241,109127129,286886801 %N A278613 Sum of terms in level n of TRIP - Stern sequence associated with permutation triple (e,e,132). %H A278613 I. Amburg, K. Dasaratha, L. Flapan, T. Garrity, C. Lee, C. Mihailak, N. Neumann-Chun, S. Peluse, M. Stoffregen, <a href="https://arxiv.org/abs/1509.05239">Stern Sequences for a Family of Multidimensional Continued Fractions: TRIP-Stern Sequences</a>, arXiv:1509.05239 [math.CO], 17 Sep 2015. %F A278613 Conjecture: G.f.: ( -3-5*x-7*x^2 ) / ( -1+x+2*x^2+6*x^3 ). - _R. J. Mathar_, Dec 02 2016 %Y A278613 Cf. A278612, A278614, A278615, A278616. %K A278613 nonn,more %O A278613 0,1 %A A278613 _Ilya Amburg_, Nov 23 2016 %E A278613 New offset and a(10)-a(19) from _R. J. Mathar_, Dec 02 2016