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 A122199 #21 Jul 24 2025 20:48:31 %S A122199 0,1,2,3,4,7,6,5,8,13,14,15,12,11,10,9,16,25,26,27,28,31,30,29,24,21, %T A122199 22,23,20,19,18,17,32,49,50,51,52,55,54,53,56,61,62,63,60,59,58,57,48, %U A122199 41,42,43,44,47,46,45,40,37,38,39,36,35,34,33,64,97,98,99,100,103,102 %N A122199 Permutation of natural numbers: a recursed variant of A122155. %C A122199 Maps between A096111 and A096115. %H A122199 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A122199 a(0)=0, otherwise a(n) = A053644(A122155(n)) + a(A053645(A122155(n))). %o A122199 (Scheme) (define (A122199 n) (if (< n 1) n (let ((m (A122155 n))) (+ (A053644 m) (A122199 (A053645 m)))))) %Y A122199 Inverse: A122198. %Y A122199 Cf. A053644, A053645, A096111, A096115, A122155. %K A122199 nonn %O A122199 0,3 %A A122199 _Antti Karttunen_, Aug 25 2006