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Search: id:A117174
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| A117174 |
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Row sums of triangle A117170 of Inverse-Shift-Moebius coefficients, and so equals the Inverse-Shift-Moebius transform of [1,1,1,...]. |
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+0
5
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| 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
(list; graph; listen)
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OFFSET
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1,2
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PROGRAM
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(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]))}
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CROSSREFS
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Cf. A117170 (triangle), A117171 (column 1), A117172 (column 2), A117173 (column 3).
Sequence in context: A114707 A000015 A122411 this_sequence A022473 A082352 A122320
Adjacent sequences: A117171 A117172 A117173 this_sequence A117175 A117176 A117177
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KEYWORD
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nonn
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AUTHOR
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Wouter Meeussen (wouter.meeussen(AT)pandora.be) and Paul D. Hanna (pauldhanna(AT)juno.com), Mar 05 2006
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