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 A325829 #15 Sep 10 2019 14:16:58 %S A325829 0,1,2,3,4,5,6,7,17,9,10,11,12,13,14,15,16,26,18,19,20,21,22,23,24,25, %T A325829 35,27,28,29,30,31,32,33,34,44,36,37,38,39,40,41,42,43,53,45,46,47,48, %U A325829 49,50,51,52,62,54,55,56,57,58,59,60,61,71,63,64,65,66,67,68,69,70 %N A325829 "Sloping nonary numbers": write numbers in nonary under each other (right-justified), read diagonals in upward direction, convert to decimal. %H A325829 Seiichi Manyama, <a href="/A325829/b325829.txt">Table of n, a(n) for n = 0..10000</a> %Y A325829 Cf. A102370 (base 2), A109681 (base 3), A325644 (base 4), A325645 (base 5), A325692 (base 6), A325693 (base 7), A325805 (base 8), this sequence (base 9), A103205 (base 10). %K A325829 nonn,base %O A325829 0,3 %A A325829 _Seiichi Manyama_, Sep 07 2019