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 A380181 #11 Jan 17 2025 16:31:47 %S A380181 0,1,4,3,2,13,12,10,9,11,8,7,6,5,40,39,37,36,31,30,28,27,38,35,29,26, %T A380181 34,33,25,24,32,23,22,21,19,18,20,17,16,15,14,121,120,118,117,112,111, %U A380181 109,108,94,93,91,90,85,84,82,81,119,116,110,107,92,89,83,80 %N A380181 Distinct nonpositive values of A380180, negated, in order of appearance and with offset 0. %C A380181 This sequence is a permutation of the nonnegative integers with inverse A380182. %H A380181 Rémy Sigrist, <a href="/A380181/b380181.txt">Table of n, a(n) for n = 0..9832</a> %H A380181 Rémy Sigrist, <a href="/A380181/a380181.gp.txt">PARI program</a> %H A380181 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A380181 Sequence A380180 begins: 0, 0, 1, -1, 0, 2, 3, 0, 3, 0, 1, 3, 4, -4, -3. %e A380181 The present sequence begins: 0, 1, 4, 3. %o A380181 (PARI) \\ See Links section. %Y A380181 Cf. A380180, A380182 (inverse). %K A380181 nonn,base %O A380181 0,3 %A A380181 _Rémy Sigrist_, Jan 15 2025