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 A361808 #8 Mar 25 2023 13:18:36 %S A361808 1,2,3,4,5,6,7,9,11,8,10,13,14,12,15,22,18,20,25,17,19,16,32,29,23,21, %T A361808 38,24,40,27,51,54,26,28,30,43,63,35,33,36,80,34,98,31,49,46,119,66, %U A361808 44,41,42,39,145,72,37,47,53,58,173,55,207,71,61,114,48,45 %N A361808 Inverse permutation to A181820. %C A361808 The partition with Heinz number n is given by the prime signature of A025487(a(n)). %H A361808 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the positive integers</a> %F A361808 a(A181820(n)) = A181820(a(n)) = n. %e A361808 The partition with Heinz number 18 = prime(1)^1*prime(2)^2 is (1,2,2), and prime(1)^2*prime(2)^2*prime(3)^1 = 180 = A025487(20), so a(18) = 20. %Y A361808 Cf. A025487, A181820, A361809 (fixed points). %K A361808 nonn %O A361808 1,2 %A A361808 _Pontus von Brömssen_, Mar 25 2023