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%I #7 Oct 14 2012 09:53:22
%S 1,4,2,7,5,3,10,8,6,13,11,9,16,14,12,19,17,15,22,20,18,25,23,21,28,26,
%T 24,31,29,27,34,32,30,37,35,33,40,38,36,43,41,39,46,44,42,49,47,45,52,
%U 50,48,55,53,51,58,56,54,61,59,57,64,62,60
%N Permutation of natural numbers generated by 3-rowed array shown below.
%C 1 4 7 10 13 16 19 22 25...a(n)=3n+1 => A016777
%C 2 5 8 11 14 17 20 23 26...a(n)=3n+2 => A016789
%C 3 6 9 12 15 18 21 24 27...a(n)=3n => A008585
%C Reversing the direction of the diagonals gives A143097. - _Jeremy Gardiner_, Oct 14 2012.
%D M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988
%D Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997
%F For n > 1, a(n+5) = a(n) + 6, iff a(n+5)<a(n): a(n+3k) = a(n) + 3k with k >=1.
%Y Cf. A088520, A090243, A090298, A143097.
%K easy,nonn
%O 1,2
%A _Giovanni Teofilatto_, Mar 05 2006
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