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Search: id:A117172
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| A117172 |
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Column 2 of triangle A117170 of Inverse-Shift-Moebius coefficients, and so equals the Inverse-Shift-Moebius transform of [0,1,0,0,...]. |
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+0
5
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| 0, 1, 0, 1, 1, 2, 1, 3, 1, 4, 2, 4, 2, 6, 3, 6, 4, 7, 3, 10, 5, 9, 6, 10, 7, 13, 7, 12, 9, 16, 8, 17, 10, 17, 14, 18, 12, 20, 13, 24, 16, 26, 15, 27, 20, 25, 19, 30, 18, 34, 23, 33, 26, 37, 28, 41, 26, 36, 28, 45, 30, 48, 35, 47, 38, 50, 33, 55, 42, 59, 41, 60, 39, 61, 51, 61, 53, 69
(list; graph; listen)
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OFFSET
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1,6
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PROGRAM
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(PARI) {a(n)=if(n<2, 0, prod(i=0, n, matrix(n, n, r, c, if(r>=c, if((r+i)%(c+i)==0, 1, 0))))[n, 2])}
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CROSSREFS
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Cf. A117170 (triangle), A117171 (column 1), A117173 (column 3), A117174 (row sums).
Sequence in context: A074206 A108466 A087145 this_sequence A029207 A111902 A078898
Adjacent sequences: A117169 A117170 A117171 this_sequence A117173 A117174 A117175
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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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