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 A093650 #22 Jun 15 2022 01:55:29 %S A093650 1,2,6,3,5,7,12,4,8,20,13,11,9,19,21,30,14,10,18,22,42,31,29,15,17,23, %T A093650 41,43,56,32,28,16,24,40,44,72,57,55,33,27,25,39,45,71,73,90,58,54,34, %U A093650 26,38,46,70,74,110,91,89,59,53,35,37,47,69,75,109,111 %N A093650 Natural numbers arranged in a square maze beginning 1, 2, 3, then moving right, then up, right, down, left, down, right, etc., and read by antidiagonals upwards. %H A093650 Jinyuan Wang, <a href="/A093650/b093650.txt">Rows n = 1..100 of triangle, flattened</a> %H A093650 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A093650 a(3) = 6 because the maze begins 2 under 1, 3 under 2, 4 right of 3, 5 right of 2 and 6 right of 1. %e A093650 Array begins: %e A093650 1 6---7 20 ... %e A093650 | | | | %e A093650 2 5 8 19 ... %e A093650 | | | | %e A093650 3---4 9 18 ... %e A093650 | | %e A093650 12--11--10 17 ... %e A093650 | | %e A093650 13--14--15--16 ... %e A093650 ... %Y A093650 Cf. A080335, A081347, A081348. %Y A093650 Other square mazes: A081344, A081349. %K A093650 nonn,tabl %O A093650 1,2 %A A093650 _Michael Joseph Halm_, May 15 2004 %E A093650 More terms from _Jinyuan Wang_, Jun 15 2022