A165661 - OEIS

%I #2 Mar 30 2012 17:35:24

%S 1,1,1,1,1,1,1,1,1,1,1,1,3,1,1,1,1,2,2,1,1,1,1,5,10,5,1,1,1,1,3,5,5,3,

%T 1,1,1,1,7,7,35,7,7,1,1,1,1,4,28,14,14,28,4,1,1,1,1,9,12,21,126,21,12,

%U 9,1,1,1,1,5,15,30,42,42,30,15,5,1,1,1,1,11,55,165,66,77,66,165,55,11,1,1

%N Triangle read by rows: denominator of n/binomial(n,m).

%C First difference from A107711 is at T(10,4) = 21 instead of 42.

%F T(n,m) = binomial(n,m)/gcd(n,binomial(n,m)).

%Y Cf. A159335 (numerators), A107711, A007318, A109004.

%K frac,nonn,tabl

%O 0,13

%A _Franklin T. Adams-Watters_, Sep 24 2009