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A131968 Interspersion of the Farey fractal sequence, A131967. 1
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, 20, 16, 61, 60, 51, 48, 37, 32, 26, 19, 86, 85, 71, 68, 54, 46, 38, 31, 22 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A permutation of the natural numbers.

REFERENCES

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

LINKS

Table of n, a(n) for n=1..45.

FORMULA

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

EXAMPLE

Northwest corner:

1 3 6 11 18

2 5 10 17 28

4 8 14 23 35

7 13 21 33 48

CROSSREFS

Cf. A131967.

Sequence in context: A145522 A283939 A293056 * A191740 A132665 A255122

Adjacent sequences:  A131965 A131966 A131967 * A131969 A131970 A131971

KEYWORD

nonn,tabl

AUTHOR

Clark Kimberling, Aug 02 2007

STATUS

approved

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Last modified June 20 20:36 EDT 2021. Contains 345235 sequences. (Running on oeis4.)