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Integer permutation induced by A024431.
5

%I #9 Sep 16 2014 16:16:03

%S 1,6,15,3,2,5,4,28,45,10,66,9,14,91,13,8,7,120,12,11,153,190,21,231,

%T 276,20,325,378,435,496,27,561,630,26,703,19,780,18,861,946,1035,17,

%U 16,25,1128,24,1225,1326,1431,23,22,1540,1653,36,1770,1891,2016,2145

%N Integer permutation induced by A024431.

%C a(n) = A115406(n)*(A115406(n)-1)/2 + A115407(n) + 1;

%C inverse: A115409.

%H Reinhard Zumkeller, <a href="/A115408/b115408.txt">Table of n, a(n) for n = 1..1000</a>

%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>

%o (Haskell)

%o import Data.List (elemIndex); import Data.Maybe (fromJust)

%o a115408 = (+ 1) . fromJust . (`elemIndex` a115409_list)

%o -- _Reinhard Zumkeller_, Sep 16 2014

%K nonn

%O 1,2

%A _Reinhard Zumkeller_, Jan 22 2006