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 A064666 #13 Dec 16 2020 05:58:11 %S A064666 7,14,13,28,26,27,22,19,37,67,128,122,114,102,95,85,84,77,78,70,55,53, %T A064666 100,86,80,72,63,51,34,32,31,61,115,111,68,65,54,48,45,39,29,57,38,36, %U A064666 30,23,43,81,76,71,134,127,236,224,195,172,164,158,150,141,90 %N A064666 Regard A064413 as giving a permutation of the positive integers; sequence gives first infinite cycle, reading backwards beginning at its smallest term, 7. %H A064666 Rémy Sigrist, <a href="/A064666/b064666.txt">Table of n, a(n) for n = 1..525</a> %H A064666 J. C. Lagarias, E. M. Rains and N. J. A. Sloane, <a href="https://arxiv.org/abs/math/0204011">The EKG sequence</a>, arXiv:math/0204011 [math.NT], 2002; Exper. Math. 11 (2002), 437-446. %H A064666 <a href="/index/Ed#EKG">Index entries for sequences related to EKG sequence</a> %e A064666 Permutation has cycles (1) (2) (3, 4, 6, 9, 10, 5) ( ..., 20, 18, 12, 7, 14, 13, 28, 26, ...) (8) ... %Y A064666 Cf. A064413, A064665, A064667, A064668, A064669. %K A064666 nonn %O A064666 1,1 %A A064666 _N. J. A. Sloane_, Oct 11 2001