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 A285202 #13 May 03 2017 17:33:47 %S A285202 1,1,2,1,1,2,3,2,1,1,2,3,2,1,1,2,3,4,3,2,1,1,2,3,2,1,1,2,3,4,3,2,1,1, %T A285202 2,3,2,1,1,2,3,4,3,2,1,1,2,3,2,1,1,2,3,4,5,4,3,2,1,1,2,3,2,1,1,2,3,4, %U A285202 3,2,1,1,2,3,2,1,1,2,3,4,3,2,1,1,2,3,2,1,1,2,3,4,5,4,3,2,1 %N A285202 A285200 displayed as an irregular triangle read by rows. %C A285202 This is Ken Knowlton's elevator sequence A285200, but with an extra 1 each time the elevator returns to (or starts at) the first floor. %C A285202 Row lengths are A285204. The row maxima are given in A285203 (for n>0). %e A285202 Triangle begins: %e A285202 1, %e A285202 1, 2, 1, %e A285202 1, 2, 3, 2, 1, %e A285202 1, 2, 3, 2, 1, %e A285202 1, 2, 3, 4, 3, 2, 1, %e A285202 1, 2, 3, 2, 1, %e A285202 1, 2, 3, 4, 3, 2, 1, %e A285202 1, 2, 3, 2, 1, %e A285202 1, 2, 3, 4, 3, 2, 1, %e A285202 1, 2, 3, 2, 1, %e A285202 1, 2, 3, 4, 5, 4, 3, 2, 1, %e A285202 ... %Y A285202 Cf. A285200, A285201, A285203, A285204. %K A285202 nonn,tabf %O A285202 0,3 %A A285202 _N. J. A. Sloane_, May 03 2017