A186978 - OEIS

%I #7 Mar 30 2012 17:37:34

%S 6,0,0,2,56,1,219,13,27,15,777,28,640,102,563,127,3923,28,7859,1792,

%T 1505,966,2354,392,21313,2289,3969,1344,42828,714,69360,7566,8118,

%U 8826,122883,5082,93084,10890,33594,19338,266024,11011,82350,23298,63917

%N Number of ordered septuples of distinct pairwise coprime positive integers with largest element n.

%H Alois P. Heinz, <a href="/A186978/b186978.txt">Table of n, a(n) for n = 13..200</a>

%e a(16) = 2 because there are 2 ordered septuples of distinct pairwise coprime positive integers with largest element 16: (1,3,5,7,11,13,16), (1,5,7,9,11,13,16).

%Y Column 7 of triangle A186972. First differences of A186983.

%K nonn

%O 13,1

%A _Alois P. Heinz_, Mar 02 2011