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 A371261 #16 Apr 01 2024 12:09:32 %S A371261 0,2,1,7,8,6,5,3,4,22,23,21,25,26,24,20,19,18,17,16,15,11,9,10,14,12, %T A371261 13,67,68,66,70,71,69,65,64,63,76,77,75,79,80,78,74,73,72,62,61,60,59, %U A371261 58,57,56,55,54,53,52,51,50,49,48,47,46,45,35,34,33,29,27 %N A371261 Lexicographically latest sequence of distinct nonnegative integers such that the run lengths transforms of the ternary expansions of n and of a(n) are the same. %C A371261 This sequence is a self-inverse permutation of the nonnegative integers. %H A371261 Rémy Sigrist, <a href="/A371261/b371261.txt">Table of n, a(n) for n = 0..6560</a> %H A371261 Rémy Sigrist, <a href="/A371261/a371261.gp.txt">PARI program</a> %H A371261 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A371261 A371256(a(n)) = A371256(n). %F A371261 a(A371257(n, k)) = A371257(n, 2^A005811(n) + 1 - k) for any n >= 0 and k in 1..2^A005811(n). %e A371261 The first terms, in decimal and in base 3, are: %e A371261 n a(n) ter(n) ter(a(n)) %e A371261 -- ---- ------ --------- %e A371261 0 0 0 0 %e A371261 1 2 1 2 %e A371261 2 1 2 1 %e A371261 3 7 10 21 %e A371261 4 8 11 22 %e A371261 5 6 12 20 %e A371261 6 5 20 12 %e A371261 7 3 21 10 %e A371261 8 4 22 11 %e A371261 9 22 100 211 %e A371261 10 23 101 212 %e A371261 11 21 102 210 %e A371261 12 25 110 221 %e A371261 13 26 111 222 %e A371261 14 24 112 220 %e A371261 15 20 120 202 %o A371261 (PARI) \\ See Links section. %Y A371261 See A371267 for a similar sequence. %Y A371261 Cf. A371256, A371257. %K A371261 nonn,base %O A371261 0,2 %A A371261 _Rémy Sigrist_, Mar 16 2024