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 A163329 #10 Jul 03 2025 20:39:30 %S A163329 0,1,3,2,4,7,5,8,12,6,10,15,11,16,22,17,23,30,21,28,36,29,37,46,38,47, %T A163329 57,9,13,18,14,19,25,20,26,33,24,31,39,32,40,49,41,50,60,48,58,69,59, %U A163329 70,82,71,83,96,27,34,42,35,43,52,44,53,63,51,61,72,62,73,85,74,86,99 %N A163329 Inverse permutation to A163328. %H A163329 A. Karttunen, <a href="/A163329/b163329.txt">Table of n, a(n) for n = 0..6560</a> %H A163329 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A163329 a(n) = A001477bi(A163325(n),A163326(n)), where A001477bi(x,y) = (((x+y)^2)+x+(3y))/2. %o A163329 (Scheme) (define (A163329 n) (A001477bi (A163325 n) (A163326 n))) %o A163329 (define (A001477bi x y) (/ (+ (expt (+ x y) 2) x (* 3 y)) 2)) %Y A163329 Inverse: A163328. a(n) = A163331(A163327(n)). A054239 is an analogous sequence for binary. Cf. A007089. %K A163329 nonn %O A163329 0,3 %A A163329 _Antti Karttunen_, Jul 29 2009