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A137766 Elements to the right of the central element in writing first the numerator and then the denominator (left to right) of Leibniz's harmonic-like triangle. 3
1, 2, 1, 3, 7, 12, 1, 4, 9, 20, 1, 5, 49, 60, 11, 30, 1, 6, 71, 105, 13, 42, 1, 7, 351, 280, 97, 168, 15, 56, 1, 8, 545, 504, 127, 252, 17, 72, 1, 9, 2561, 1260, 799, 840, 161, 360, 19, 90, 1, 10, 4159, 2310, 1121, 1320, 199, 495, 21, 110, 1, 11 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..60.

EXAMPLE

1/1; -->

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

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

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

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

CROSSREFS

Cf. A137752.

Cf. A046201, A046204, A046205, A046206, A046208, A046212, A137752, A137753, A137754, A137755, A137756, A137757, A137758, A137759, A137760, A137761, A137762, A137763, A137764, A137765.

Sequence in context: A024404 A077173 A063509 * A294620 A010758 A259419

Adjacent sequences:  A137763 A137764 A137765 * A137767 A137768 A137769

KEYWORD

nonn,tabf,frac,less

AUTHOR

Mohammad K. Azarian, Feb 13 2008

STATUS

approved

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Last modified January 27 13:38 EST 2022. Contains 350607 sequences. (Running on oeis4.)