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.

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

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