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 A383784 #8 May 12 2025 14:41:30 %S A383784 0,1,2,3,4,5,7,8,9,10,12,13,16,17,18,19,20,21,25,26,27,28,29,31,32,34, %T A383784 36,37,39,40,41,43,45,48,49,50,52,53,57,58,61,63,64,65,67,68,72,73,74, %U A383784 75,76,79,80,81,82,84,85,89,90,91,93,97,98,100,101,103,104 %N A383784 Norms of vectors in any regular planar tiling (square or A2 lattice). %H A383784 C. S. Davis, <a href="/A383784/b383784.txt">Table of n, a(n) for n = 1..17641</a> %Y A383784 Union of A001481 and A003136. %Y A383784 Complement of A383785. %Y A383784 Subsequence of A000401. %K A383784 nonn %O A383784 1,3 %A A383784 _C. S. Davis_, May 09 2025