A115408 Integer permutation induced by A024431.

1, 6, 15, 3, 2, 5, 4, 28, 45, 10, 66, 9, 14, 91, 13, 8, 7, 120, 12, 11, 153, 190, 21, 231, 276, 20, 325, 378, 435, 496, 27, 561, 630, 26, 703, 19, 780, 18, 861, 946, 1035, 17, 16, 25, 1128, 24, 1225, 1326, 1431, 23, 22, 1540, 1653, 36, 1770, 1891, 2016, 2145

Offset

1,2

Comments

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

inverse: A115409.

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

Index entries for sequences that are permutations of the natural numbers

Prog

(Haskell)
import Data.List (elemIndex); import Data.Maybe (fromJust)
a115408 = (+ 1) . fromJust . (`elemIndex` a115409_list)
-- Reinhard Zumkeller, Sep 16 2014

Crossrefs

Sequence in context: A013314 A328339 A019306 * A327602 A105052 A003566

Adjacent sequences: A115405 A115406 A115407 * A115409 A115410 A115411

Keyword

nonn

Author

Reinhard Zumkeller, Jan 22 2006

Status

approved