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 A096781 #10 Mar 25 2022 18:42:53 %S A096781 1,2,3,4,9,16,12,10,18,48,6,20,30,28,40,36,21,104,99,70,150,8,25,54, %T A096781 56,96,100,11,72,81,132,192,26,195,224,350,49,126,121,39,221,280,135, %U A096781 345,304,110,55,168,294,225,390,384,68,323,414,5,7,80,117,160,154,252 %N A096781 a(n) = A075383(A075383(n)). %C A096781 Integer permutation with inverse A096782: a(A096782(n)) = A096782(a(n)) = n; %C A096781 A096780(a(n)) = a(A096780(n)) = A075383(n). %H A096781 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A096781 (Haskell) %o A096781 a096781 = a . a where a = (a075383_list !!) . subtract 1 %o A096781 -- _Reinhard Zumkeller_, Nov 29 2015 %Y A096781 Cf. A075383. %K A096781 nonn %O A096781 1,2 %A A096781 _Reinhard Zumkeller_, Jul 09 2004