A046205 - OEIS

%I #12 Apr 05 2015 01:21:03

%S 1,1,1,2,1,2,1,3,1,6,1,3,1,4,1,12,1,12,1,4,1,5,1,20,1,30,1,20,1,5,1,6,

%T 1,30,1,60,1,60,1,30,1,6,1,7,1,42,1,105,1,140,1,105,1,42,1,7,1,8,1,56,

%U 1,168,1,280,1,280,1,168,1,56,1,8,1,9,1,72,1,252,1,504,1,630,1,504,1

%N In Leibniz's Harmonic Triangle, write numerator first and then denominator of each element.

%D L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 83, Problem 25.

%e 1/1;

%e 1/2, 1/2;

%e 1/3, 1/6, 1/3;

%e 1/4, 1/12, 1/12, 1/4;

%e 1/5, 1/20, 1/30, 1/20, 1/5; ...

%Y Cf. A003506, A046206, A046212, A046201, A046204, A046208, A007622, A137752, A137753, A137754.

%K tabf,nonn,easy,less

%O 1,4

%A _Mohammad K. Azarian_

%E More terms from Gregory D Johnson (gjohn(AT)iname.com)

%E Edited by _M. F. Hasler_, Apr 05 2015