A137761 Distinct numbers in writing first denominator and then numerator (left to right) of Leibniz's harmonic-like triangle.

1, 2, 3, 6, 5, 4, 12, 7, 20, 9, 30, 31, 11, 60, 49, 42, 13, 105, 71, 140, 209, 8, 56, 15, 168, 97, 280, 351, 72, 17, 252, 127, 504, 545, 630, 1471, 10, 90, 19, 360, 161, 840, 799, 1260, 2561, 110, 21, 495, 199, 1320, 1121, 2310, 4159, 2772, 10625

Offset

1,2

Links

Table of n, a(n) for n=1..55.

Example

1/1; --> 1
1/2, 1/2;  --> 2
1/3, 5/6, 1/3;  --> 3 6 5
1/4, 7/12, 7/12, 1/4;
1/5, 9/20, 31/30, 9/20, 1/5;

Crossrefs

Cf. A046201; A046204; A046205; A046206; A046208; A046212; A137752; A137753; A137754; A137755; A137756; A137757; A137758; A137759, A137760.

Sequence in context: A218890 A269373 A269374 * A100769 A353977 A023889

Adjacent sequences: A137758 A137759 A137760 * A137762 A137763 A137764

Keyword

frac,nonn,tabf,less

Author

Mohammad K. Azarian, Feb 11 2008

Status

approved