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A118012 a(n) = 4*A117384(n) - n; a self-inverse permutation of the natural numbers. 2
3, 6, 1, 8, 11, 2, 13, 4, 15, 18, 5, 20, 7, 22, 9, 24, 27, 10, 29, 12, 31, 14, 33, 16, 35, 38, 17, 40, 19, 42, 21, 44, 23, 46, 25, 48, 51, 26, 53, 28, 55, 30, 57, 32, 59, 34, 61, 36, 63, 66, 37, 68, 39, 70, 41, 72, 43, 74, 45, 76, 47, 78, 49, 80, 83, 50, 85, 52, 87, 54, 89, 56 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A117384 is defined by A117384(n) = A117384(k) when k = 4*A117384(n) - n. A001614 is the Connell sequence generated as: 1 odd, 2 even, 3 odd, .. and A118011 is the complement of A001614.

LINKS

Table of n, a(n) for n=1..72.

FORMULA

a(a(n)) = n; a(A118011(n)) = a(4*n - A001614(n)) = A001614(n).

CROSSREFS

Cf. A117384, A001614, A118011.

Sequence in context: A259501 A118948 A176092 * A022836 A090911 A198491

Adjacent sequences:  A118009 A118010 A118011 * A118013 A118014 A118015

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Apr 10 2006

STATUS

approved

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Last modified January 22 12:13 EST 2019. Contains 319363 sequences. (Running on oeis4.)