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 A276954 #7 Sep 24 2016 10:49:54 %S A276954 1,3,2,4,7,6,11,5,16,22,29,8,37,12,46,56,67,79,92,106,121,137,154,10, %T A276954 172,17,191,211,232,9,254,23,277,301,326,30,352,38,379,407,436,466, %U A276954 497,529,562,596,631,13,667,47,704,742,781,18,821,57,862,904,947,68,991,80,1036,1082,1129,1177,1226,1276,1327,1379,1432,93 %N A276954 Inverse permutation to A276953. %H A276954 Antti Karttunen, <a href="/A276954/b276954.txt">Table of n, a(n) for n = 1..10000</a> %H A276954 <a href="/index/Fa#facbase">Index entries for sequences related to factorial base representation</a> %H A276954 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A276954 a(n) = (1/2) * ((c+r)^2 - r - 3*c + 2), where c = A276951(n), and r = A276949(n). %F A276954 As a composition of other permutations: %F A276954 a(n) = A257504(A275847(n)). %o A276954 (Scheme) (define (A276954 n) (let ((col (A276951 n)) (row (A276949 n))) (* (/ 1 2) (- (expt (+ row col) 2) row col col col -2)))) %Y A276954 Inverse: A276953. %Y A276954 Cf. A276949, A276951. %Y A276954 Related or similar permutations: A257504, A275847. %K A276954 nonn,base %O A276954 1,2 %A A276954 _Antti Karttunen_, Sep 22 2016