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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
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 83, Problem 25.
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EXAMPLE
| 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
| Cf. A003506.
Sequence in context: A109043 A054585 A190940 * A100495 A056463 A005992
Adjacent sequences: A046200 A046201 A046202 * A046204 A046205 A046206
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KEYWORD
| tabf,nonn,easy
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AUTHOR
| Mohammad K. Azarian (ma3(AT)evansville.edu)
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Dec 13 1999
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