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A131968
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Interspersion of the Farey fractal sequence, A131967.
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1
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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; internal format)
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OFFSET
| 1,2
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COMMENTS
| A permutation of the natural numbers.
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REFERENCES
| C. Kimberling, "Fractal sequences and interspersions," Ars Combinatoria 45 (1997) 157-168.
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FORMULA
| Rectangular array T given by antidiagonals. T(i,j) = the j-th index n such that A131967(n)=i.
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EXAMPLE
| Northwest corner:
1 3 6 11 18
2 5 10 17 28
4 8 14 23 35
7 13 21 33 48
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CROSSREFS
| Cf. A131967.
Sequence in context: A194909 A038722 A145522 * A191740 A132665 A191445
Adjacent sequences: A131965 A131966 A131967 * A131969 A131970 A131971
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KEYWORD
| nonn,tabl
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu), Aug 02 2007
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