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 A131966 #9 Jul 26 2019 17:24:20 %S A131966 1,2,3,4,6,5,7,9,8,10,11,14,13,15,12,16,19,18,21,17,20,22,26,24,28,23, %T A131966 27,25,29,33,31,35,30,34,32,36,37,42,40,44,39,43,41,45,38,46,51,49,54, %U A131966 48,53,50,55,47,52,56,62,59,65,58,64,61,66,57,63,60,67,73,70,76,69,75,72,78,68,74,71,77 %N A131966 Interspersion associated with the Cantor fractal sequence, A088370. %C A131966 A permutation of the natural numbers. %D A131966 C. Kimberling, "Fractal sequences and interspersions," Ars Combinatoria 45 (1997) 157-168. %H A131966 Alois P. Heinz, <a href="/A131966/b131966.txt">Antidiagonals n = 1..200, flattened</a> %F A131966 T is a rectangular array given by antidiagonals: T(i,j) = the j-th index n for which A088370(n) = i. %e A131966 Northwest corner: %e A131966 1, 2, 4, 7, 11, 16, 22, 29, 37, 46, ... %e A131966 3, 6, 9, 14, 19, 26, 33, 42, 51, 62, ... %e A131966 5, 8, 13, 18, 24, 31, 40, 49, 59, 70, ... %e A131966 10, 15, 21, 28, 35, 44, 54, 65, 76, 89, ... %e A131966 12, 17, 23, 30, 39, 48, 58, 69, 81, 94, ... %e A131966 20, 27, 34, 43, 53, 64, 75, 88, 101, 116, ... %e A131966 25, 32, 41, 50, 61, 72, 85, 98, 112, 127, ... %e A131966 36, 45, 55, 66, 78, 91, 105, 120, 135, 152, ... %e A131966 38, 47, 57, 68, 80, 93, 107, 122, 139, 156, ... %e A131966 52, 63, 74, 87, 100, 115, 130, 147, 165, 184, ... %Y A131966 Cf. A088370. %K A131966 nonn,tabl %O A131966 1,2 %A A131966 _Clark Kimberling_, Aug 02 2007 %E A131966 Typo in a(18) corrected by _Alois P. Heinz_, Jul 26 2019