A137763 - OEIS

A137763

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

1, 1, 6, 5, 30, 31, 140, 209, 630, 1471, 2772, 10625

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

FORMULA

a(2n) = A137762(2n-1); a(2n-1) = A137762(2n) = A046212(2n-1) = A056040(2n-1) = A100071(2n-1). - M. F. Hasler, Jan 25 2012

EXAMPLE

1/1; --> 1 1

1/2, 1/2; -->

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

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

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

CROSSREFS

KEYWORD

nonn,tabf,frac,less

AUTHOR

STATUS

approved