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URL: https://oeis.org/A131968

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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
OFFSET
1,2
COMMENTS
A permutation of the natural numbers.
REFERENCES
C. Kimberling, "Fractal sequences and interspersions," Ars Combinatoria 45 (1997) 157-168.
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
KEYWORD
nonn,tabl
AUTHOR
Clark Kimberling, Aug 02 2007
STATUS
approved