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A137753 First denominator and then numerator (left to right) of Leibniz's harmonic-like triangle. 18
1, 1, 2, 1, 2, 1, 3, 1, 6, 5, 3, 1, 4, 1, 12, 7, 12, 7, 4, 1, 5, 1, 20, 9, 30, 31, 20, 9, 5, 1, 6, 1, 30, 11, 60, 49, 60, 49, 30, 11, 6, 1, 7, 1, 42, 13, 105, 71, 140, 209, 105, 71, 42, 13, 7, 1, 8, 1, 56, 15, 168, 97, 280, 351, 280, 351, 168, 97 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..68.

EXAMPLE

1/1; --> 1 1

1/2, 1/2; --> 2 1 2 1

1/3, 5/6, 1/3; --> 3 1 6 5 3 1

1/4, 7/12, 7/12, 1/4; --> 4 1 12 7 12 7 4 1

1/5, 9/20, 31/30, 9/20, 1/5; --> 5 1 20 9 30 31 20 9 5 1

CROSSREFS

Cf. A003506; A007622; A046201; A046204; A046205; A046206; A046208; A046212; A137752.

Cf. A137752

Sequence in context: A324194 A046205 A046206 * A134780 A247379 A154819

Adjacent sequences:  A137750 A137751 A137752 * A137754 A137755 A137756

KEYWORD

frac,nonn,tabf,less

AUTHOR

Mohammad K. Azarian, Feb 10 2008

STATUS

approved

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Last modified June 25 21:43 EDT 2019. Contains 324357 sequences. (Running on oeis4.)