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 A368053 #12 Dec 30 2023 23:56:04 %S A368053 1,2,2,3,1,3,4,3,1,4,5,4,2,2,5,6,5,4,1,3,6,7,6,5,3,1,4,7,8,7,6,5,2,2, %T A368053 5,8,9,8,7,6,4,1,3,6,9,10,9,8,7,6,3,1,4,7,10,11,10,9,8,7,5,2,2,5,8,11, %U A368053 12,11,10,9,8,7,4,1,3,6,9,12,13,12,11,10,9,8,6,3,1,4,7,10,13 %N A368053 Array read by descending antidiagonals, where row n=0 lists the natural numbers. Each new row n=1,2,... is found by taking the number n in the previous row and "leaping" it over the next n terms to its right, while reversing the order of the skipped terms. (see example). %e A368053 The array begins: %e A368053 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, ... %e A368053 2, 1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, ... %e A368053 3, 1, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, ... %e A368053 4, 2, 1, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, ... %e A368053 5, 3, 1, 2, 4, 6, 7, 8, 9, 10, 11, 12, 13, ... %e A368053 6, 4, 2, 1, 3, 5, 7, 8, 9, 10, 11, 12, 13, ... %e A368053 7, 5, 3, 1, 2, 4, 6, 8, 9, 10, 11, 12, 13, ... %e A368053 8, 6, 4, 2, 1, 3, 5, 7, 9, 10, 11, 12, 13, ... %e A368053 9, 7, 5, 3, 1, 2, 4, 6, 8, 10, 11, 12, 13, ... %e A368053 10, 8, 6, 4, 2, 1, 3, 5, 7, 9, 11, 12, 13, ... %e A368053 11, 9, 7, 5, 3, 1, 2, 4, 6, 8, 10, 12, 13, ... %e A368053 12, 10, 8, 6, 4, 2, 1, 3, 5, 7, 9, 11, 13, ... %e A368053 13, 11, 9, 7, 5, 3, 1, 2, 4, 6, 8, 10, 12, ... %e A368053 ... %Y A368053 Cf. A000027 (1st row and column), A028310 (main diagonal), A367634 (similar with no reversal). %K A368053 nonn,tabl %O A368053 1,2 %A A368053 _Wesley Ivan Hurt_, Dec 09 2023