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 A379070 #17 Jan 20 2025 17:55:40 %S A379070 0,1,2,2,1,3,4,5,4,3,6,7,8,8,7,6,5,9,10,11,12,13,9,10,11,12,13,14,15, %T A379070 16,17,18,18,14,15,16,17,19,20,21,22,23,24,25,21,20,19,23,22,26,27,28, %U A379070 24,25,26,27,28,29,30,31,32,32,31,30,29,33,34,35,36,37,38,39,40,41,40,36,35,34,33,37,38,39,42,43,44,45,46,47,48,49,50,50,41,42,43,44,45 %N A379070 a(n) = |A377091(n)|. %C A379070 The absolute values of the terms in A377091, in order, including all repeats. %C A379070 The information in this sequence is of course already available in A377091, but showing just the absolute values emphasizes the initially surprising fact that there are essentially no interior points in A377091. %C A379070 The b-files here and in A379071 suggest that |a(n) - n/2| = O(sqrt(n)), and even that |a(n) - n/2| <= (1/2)*sqrt(n). %H A379070 N. J. A. Sloane, <a href="/A379070/b379070.txt">Table of n, a(n) for n = 0..20000</a> %t A379070 (* A377091list is defined at A377091 *) %t A379070 Abs[A377091list[100]] (* _Paolo Xausa_, Jan 20 2025 *) %Y A379070 Cf. A377091, A379071. %K A379070 nonn %O A379070 0,3 %A A379070 _N. J. A. Sloane_, Dec 29 2024