A117174 Row sums of triangle A117170 of Inverse-Shift-Moebius coefficients and so equals the Inverse-Shift-Moebius transform of [1,1,1,...].

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, 52, 54, 60, 54, 74, 58, 74, 74, 82, 83, 97, 77, 100, 104, 115, 100, 132, 107, 138, 137, 136, 130, 165, 140, 174, 165, 182, 166, 215, 189, 217, 200, 216, 207, 265, 208, 260, 266

Offset

1,2

Links

Table of n, a(n) for n=1..63.

Prog

(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]))}

Crossrefs

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

Sequence in context: A352921 A341141 A325353 * A320466 A342542 A338671

Adjacent sequences: A117171 A117172 A117173 * A117175 A117176 A117177

Keyword

nonn

Author

Wouter Meeussen and Paul D. Hanna, Mar 05 2006

Status

approved