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A131968 Interspersion of the Farey fractal sequence, A131967. 1

%I

%S 1,3,2,6,5,4,11,10,8,7,18,17,14,13,9,29,28,23,21,15,12,42,41,35,33,25,

%T 20,16,61,60,51,48,37,32,26,19,86,85,71,68,54,46,38,31,22

%N Interspersion of the Farey fractal sequence, A131967.

%C A permutation of the natural numbers.

%D C. Kimberling, "Fractal sequences and interspersions," Ars Combinatoria 45 (1997) 157-168.

%F Rectangular array T given by antidiagonals. T(i,j) = the j-th index n such that A131967(n)=i.

%e Northwest corner:

%e 1 3 6 11 18

%e 2 5 10 17 28

%e 4 8 14 23 35

%e 7 13 21 33 48

%Y Cf. A131967.

%K nonn,tabl

%O 1,2

%A _Clark Kimberling_, Aug 02 2007

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Last modified July 31 20:24 EDT 2021. Contains 346377 sequences. (Running on oeis4.)