A117174 - OEIS

%I #5 Mar 30 2012 18:37:44

%S 1,2,3,4,5,7,7,9,11,13,12,17,15,21,23,23,22,31,27,37,36,38,36,49,43,

%T 52,54,60,54,74,58,74,74,82,83,97,77,100,104,115,100,132,107,138,137,

%U 136,130,165,140,174,165,182,166,215,189,217,200,216,207,265,208,260,266

%N Row sums of triangle A117170 of Inverse-Shift-Moebius coefficients and so equals the Inverse-Shift-Moebius transform of [1,1,1,...].

%o (PARI) {a(n)=if(n<1,0,sum(k=1,n,prod(i=0,n, matrix(n,n,r,c,if(r>=c,if((r+i)%(c+i)==0,1,0))))[n,k]))}

%Y Cf. A117170 (triangle), A117171 (column 1), A117172 (column 2), A117173 (column 3).

%K nonn

%O 1,2

%A _Wouter Meeussen_ and _Paul D. Hanna_, Mar 05 2006