

A133256


a(4*n+1) = 4*n+1, a(4*n+2) = 4*n+2, a(4*n+3) = 4*n+4, a(4*n+4) = 4*n+3.


3



1, 2, 4, 3, 5, 6, 8, 7, 9, 10, 12, 11, 13, 14, 16, 15, 17, 18, 20, 19, 21, 22, 24, 23, 25, 26, 28, 27, 29, 30, 32, 31, 33, 34, 36, 35, 37, 38, 40, 39, 41, 42, 44, 43, 45, 46, 48, 47, 49, 50, 52, 51, 53, 54, 56, 55, 57, 58, 60, 59, 61, 62, 64, 63, 65, 66, 68, 67, 69, 70, 72, 71
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OFFSET

1,2


COMMENTS

A permutation of the positive integers, swapping consecutive values congruent to 3 and 4 (mod 4).  Franklin T. AdamsWatters, Jan 22 2012.


LINKS

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


MATHEMATICA

Table[Which[Mod[n, 4]==3, n+1, Divisible[n, 4], n1, True, n], {n, 40}] (* or *) Partition[Range[40], 4]/.{a_, b_, c_, d_}>{a, b, d, c}//Flatten (* Harvey P. Dale, Aug 29 2016 *)


CROSSREFS

Cf. A103889.
Sequence in context: A275657 A107896 A107897 * A259570 A095690 A094870
Adjacent sequences: A133253 A133254 A133255 * A133257 A133258 A133259


KEYWORD

nonn


AUTHOR

Paul Curtz, Oct 15 2007


EXTENSIONS

Definition fixed and offset changed by Franklin T. AdamsWatters, Jan 22 2012


STATUS

approved



