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A117173 Column 3 of triangle A117170 of Inverse-Shift-Moebius coefficients and so equals the Inverse-Shift-Moebius transform of [0,0,1,0,...]. 4

%I

%S 0,0,1,0,0,1,1,1,2,1,2,2,2,2,4,2,3,4,4,3,6,4,6,6,4,6,10,6,6,9,9,8,11,

%T 8,12,12,9,12,16,11,12,16,15,15,18,16,18,19,17,17,24,19,20,26,24,25,

%U 27,23,26,28,21,30,39,29,30,35,32,33,38,36,38,41,36,39,48,42,41,50,44,48

%N Column 3 of triangle A117170 of Inverse-Shift-Moebius coefficients and so equals the Inverse-Shift-Moebius transform of [0,0,1,0,...].

%o (PARI) {a(n)=if(n<3,0,prod(i=0,n, matrix(n,n,r,c,if(r>=c,if((r+i)%(c+i)==0,1,0))))[n,3])}

%Y Cf. A117170 (triangle), A117171 (column 1), A117172 (column 2), A117174 (row sums).

%K nonn

%O 1,9

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

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Last modified October 28 11:38 EDT 2021. Contains 348329 sequences. (Running on oeis4.)