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 A332343 #6 Feb 10 2020 11:33:28 %S A332343 5,1,7,5,7,9,1,1,5,11,5,7,9,9,13,1,7,1,9,7,15,5,1,9,11,5,11,17,1,7,5, %T A332343 1,7,11,9,19,5,7,9,11,13,11,11,13,21,1,1,1,9,1,11,5,7,11,23,5,7,9,9, %U A332343 13,15,11,13,13,15,25,1,7,5,11,7,1,9,13,9,13,13,27 %N A332343 Triangle T(n, k) read by rows: number of different infinite-dimensional A-graded algebras with three multiplicative generators of degrees 1, k, n (1 < k < n). %H A332343 V. I. Arnold, <a href="https://doi.org/10.1002/cpa.3160420705">A-graded algebras and continued fractions</a>, Communications on Pure and Applied Mathematics, 42 (1989), 993-1000. %F A332343 T(n, k) = A332342(n, k) * 2 + 1 [Arnold]. %e A332343 The triangle begins: %e A332343 n\k 2 3 4 5 6 7 %e A332343 3| 5 %e A332343 4| 1 7 %e A332343 5| 5 7 9 %e A332343 6| 1 1 5 11 %e A332343 7| 5 7 9 9 13 %e A332343 8| 1 7 1 9 7 15 %e A332343 ... %Y A332343 Cf. A332342. %K A332343 nonn,tabl %O A332343 3,1 %A A332343 _Andrey Zabolotskiy_, Feb 10 2020