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A046204
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Distinct even numbers in the triangle of denominators in Leibniz's Harmonic Triangle.
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16
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2, 6, 4, 12, 20, 30, 60, 42, 140, 8, 56, 168, 280, 72, 252, 504, 630, 10, 90, 360, 840, 1260, 110, 1320, 2310, 2772, 132, 660, 1980, 3960, 5544, 156, 858, 2860, 10296, 12012, 14, 182, 1092, 4004, 10010, 18018, 24024, 210, 5460, 30030, 51480, 16, 240
(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: A134000 A127730 A118416 * A163755 A100851 A204985
Adjacent sequences: A046201 A046202 A046203 * A046205 A046206 A046207
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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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