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Search: id:A046203
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| A046203 |
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Even numbers in the triangle of denominators in Leibniz's Harmonic Triangle. |
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+0
1
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| 2, 2, 6, 4, 12, 12, 4, 20, 30, 20, 6, 30, 60, 60, 30, 6, 42, 140, 42, 8, 56, 168, 280, 280, 168, 56, 8, 72, 252, 504, 630, 504, 252, 72, 10, 90, 360, 840, 1260, 1260, 840, 360, 90, 10, 110, 1320, 2310, 2772, 2310, 1320, 110, 12, 132, 660, 1980, 3960, 5544, 5544
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 83, Problem 25.
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EXAMPLE
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1/1; 1/2, 1/2; 1/3, 1/6, 1/3; 1/4, 1/12, 1/12, 1/4; 1/5, 1/20, 1/30, 1/20, 1/5; ...
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CROSSREFS
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Cf. A003506.
Sequence in context: A140524 A109043 A054585 this_sequence A100495 A056463 A005992
Adjacent sequences: A046200 A046201 A046202 this_sequence A046204 A046205 A046206
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KEYWORD
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tabf,nonn,easy
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AUTHOR
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Mohammad K. Azarian (ma3(AT)evansville.edu)
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Dec 13 1999
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