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 A246276 #7 Sep 11 2014 18:31:25 %S A246276 1,3,2,6,4,10,7,5,11,15,16,21,22,8,29,28,37,36,46,17,56,45,67,9,79,12, %T A246276 92,55,106,66,121,30,137,13,154,78,172,68,191,91,211,105,232,23,254, %U A246276 120,277,14,301,93,326,136,352,24,379,155,407,153,436,171,466,57,497,39,529,190,562,192,596,210,631,231,667,47,704,19 %N A246276 Inverse of A246275 considered as a permutation of natural numbers. %H A246276 Antti Karttunen, <a href="/A246276/b246276.txt">Table of n, a(n) for n = 1..10001</a> %H A246276 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A246276 a(n) = 1 + ((((x+y)^2) - x - 3*y)/2), where x = A055396(n+1) and y = A246277(n+1). %o A246276 (Scheme) (define (A246276 n) (let ((x (A055396 (+ 1 n))) (y (A246277 (+ 1 n)))) (* (/ 1 2) (- (expt (+ x y) 2) x y y y -2)))) %Y A246276 Inverse: A246275. %Y A246276 Cf. A055396, A246277, A246274, A246675. %K A246276 nonn %O A246276 1,2 %A A246276 _Antti Karttunen_, Aug 21 2014