login
A137762
Central elements in writing first the numerator and then the denominator (left to right) of Leibniz's harmonic-like triangle.
7
1, 1, 5, 6, 31, 30, 209, 140, 1471, 630, 10625, 2772
OFFSET
1,3
FORMULA
a(2n-1)=A137763(2n); a(2n)=A137763(2n-1)=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; --> 5 6
1/4, 7/12, 7/12, 1/4; --> ...
1/5, 9/20, 31/30, 9/20, 1/5;
KEYWORD
nonn,tabf,frac
AUTHOR
Mohammad K. Azarian, Feb 13 2008
STATUS
approved