OFFSET
0,2
REFERENCES
R. K. Guy, Unsolved Problems in Number Theory, E27.
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 0..10000
PROG
(Haskell)
import Data.List ((\\))
a067017 n = a067017_list !! n
a067017_list = [1, 4, 3, 2] ++ f [2, 3, 4, 1] where
f xs = mexi : f (mexi : xs) where
mexi = head $ [0..] \\ zipWith (+) xs (reverse xs)
-- Reinhard Zumkeller, May 05 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Feb 17 2002
EXTENSIONS
More terms from John W. Layman, Feb 20 2002
STATUS
approved