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 A244813 #7 Mar 14 2015 00:13:43
%S A244813 1,5,2,0,1,5,2,2,3,1,4,1,1,1,7,2,9,1,3,0,3,4,2,3,6,7,1,7,3,7,9,0,3,2,
%T A244813 1,2,8,3,3,4,7,8,6,6,0,7,8,9,7,0,1,2,8,7,4,5,3,8,8,9,2,3,1,2,5,2,5,6,
%U A244813 2,5,9,0,3,2,4,5,8,3,8,9,7,8,3,4,0,7,8,9,7,0,3,5,8,7,9,0,3,8,5,6,2,3,1,2,5
%N A244813 The hexagonal spiral of Champernowne, read along the West (or 270-degree) ray.
%F A244813 (3n^2 - 5n + 3)th almost natural number (A033307), Also see formula section of A056105.
%e A244813 see A244807 example section for its diagram.
%t A244813 almostNatural[n_, b_] := Block[{m = 0, d = n, i = 1, l, p}, While[m <= d, l = m; m = (b - 1) i*b^(i - 1) + l; i++]; i--; p = Mod[d - l, i]; q = Floor[(d - l)/i] + b^(i - 1); If[p != 0, IntegerDigits[q, b][[p]], Mod[q - 1, b]]]; f[n_] := 3n^2 - 5n + 3 (* see formula section of A244807 *); Array[ almostNatural[ f@#, 10] &, 105]
%Y A244813 Cf. A007376, A056108, A244807, A244808, A244809, A244810, A244811, A244812, A244814, A244815, A244816, A244817, A244818.
%K A244813 nonn,easy
%O A244813 1,2
%A A244813 _Robert G. Wilson v_, Jul 06 2014