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 A269396 #5 Mar 07 2016 12:30:38 %S A269396 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,25,20,21,22,19,24,23,26, %T A269396 27,28,29,30,45,32,33,34,35,36,31,50,39,40,49,42,41,44,37,38,43,48,55, %U A269396 46,51,52,47,54,105,56,57,58,77,60,53,90,63,64,65,66,59,68,69,70,97,72,181,62,99,100,67,78,81,80,73 %N A269396 Permutation of natural numbers: a(n) = A269394(A269172(n)) = A269172(3*A269172(n)) / 3. %C A269396 Composition of A269172 with a permutation of natural numbers obtained from its trisection. %H A269396 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A269396 a(n) = A269394(A269172(n)) = A269172(3*A269172(n)) / 3. %o A269396 (Scheme) (define (A269396 n) (A269394 (A269172 n))) %Y A269396 Inverse: A269395. %Y A269396 Cf. A269394. %Y A269396 Differs from A255408 and A269172 for the first time at n=31, which here a(31)=45, instead of 49. %K A269396 nonn %O A269396 1,2 %A A269396 _Antti Karttunen_, Mar 03 2016