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 A254052 #7 Feb 01 2015 10:02:46 %S A254052 1,3,2,4,6,7,11,5,16,22,8,29,37,10,46,56,12,67,79,17,92,106,9,121,137, %T A254052 23,154,172,30,191,211,13,232,254,38,277,301,47,326,352,15,379,407,57, %U A254052 436,466,68,497,529,18,562,596,80,631,667,93,704,742,24,781,821,107,862,904,122,947,991,14,1036,1082,138,1129,1177,155,1226,1276,31 %N A254052 Inverse permutation to A254051. %H A254052 Antti Karttunen, <a href="/A254052/b254052.txt">Table of n, a(n) for n = 1..10000</a> %H A254052 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A254052 As a composition of other permutations: %F A254052 a(n) = A254054(A064216(n)). %o A254052 (Scheme) (define (A254052 n) (let ((x (A254046 n)) (y (A253887 n))) (* (/ 1 2) (- (expt (+ x y) 2) x y y y -2)))) %Y A254052 Inverse: A254051. %Y A254052 Cf. A253887, A254046, A254047. %Y A254052 Related permutations: A064216, A254054. %K A254052 nonn %O A254052 1,2 %A A254052 _Antti Karttunen_, Jan 24 2015