A137767 Nontrivial numbers of the elements to the right of the central elements in writing first the numerator and then the denominator (left to right) of Leibniz's harmonic-like triangle.

2, 3, 7, 12, 4, 9, 20, 5, 49, 60, 11, 30, 6, 71, 105, 13, 42, 7, 351, 280, 97, 168, 15, 56, 8, 545, 504, 127, 252, 17, 72, 9, 2561, 1260, 799, 840, 161, 360, 19, 90, 10, 4159, 2310, 1121, 1320, 199, 495, 21, 110, 11

Offset

1,1

Links

Table of n, a(n) for n=1..50.

Example

1/1; -->
1/2, 1/2; --> 2
1/3, 5/6, 1/3; --> 3
1/4, 7/12, 7/12, 1/4; --> 7 12
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, A137766.

Sequence in context: A053781 A066749 A306786 * A191704 A284903 A259226

Adjacent sequences: A137764 A137765 A137766 * A137768 A137769 A137770

Keyword

nonn,tabf,frac,less

Author

Mohammad K. Azarian, Feb 13 2008

Status

approved