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%I #9 Jun 22 2013 16:05:38
%S 2,6,4,12,20,30,60,42,140,8,56,168,280,72,252,504,630,10,90,360,840,
%T 1260,110,1320,2310,2772,132,660,1980,3960,5544,156,858,2860,10296,
%U 12012,14,182,1092,4004,10010,18018,24024,210,5460,30030,51480,16,240
%N Distinct even numbers in the triangle of denominators in Leibniz's Harmonic Triangle.
%D L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 83, Problem 25.
%e 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; ...
%Y Cf. A003506.
%K tabf,nonn,easy
%O 1,1
%A _Mohammad K. Azarian_
%E More terms from _James A. Sellers_, Dec 13 1999
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