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 A380185 #6 Jan 17 2025 16:32:07 %S A380185 0,1,2,5,4,3,10,8,9,7,6,21,20,17,16,19,15,18,14,13,12,11,42,40,34,32, %T A380185 41,33,39,31,38,30,37,36,35,29,28,27,26,24,25,23,22,85,84,81,80,69,68, %U A380185 65,64,83,79,67,63,82,66,78,62,77,76,61,60,75,59,74,72,73 %N A380185 Distinct nonpositive values of A380123, negated, in order of appearance and with offset 0. %C A380185 This sequence is a permutation of the nonnegative integers with inverse A380186. %H A380185 Rémy Sigrist, <a href="/A380185/b380185.txt">Table of n, a(n) for n = 0..5461</a> %H A380185 Rémy Sigrist, <a href="/A380185/a380185.gp.txt">PARI program</a> %H A380185 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A380185 Sequence A380123 begins: 0, 0, 1, 0, 2, -1, 0, 3, 4, 0, 4, 0, 1, 4, 5, -2. %e A380185 The present sequence begins: 0, 1, 2. %o A380185 (PARI) \\ See Links section. %Y A380185 Cf. A380123, A380183, A380186 (inverse). %K A380185 nonn,base %O A380185 0,3 %A A380185 _Rémy Sigrist_, Jan 15 2025