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A066955
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Number of unordered solutions of xy+yz+zx=n, x,y,z>0.
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1
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0, 0, 1, 0, 1, 0, 1, 1, 1, 0, 2, 1, 1, 1, 2, 1, 2, 0, 2, 2, 2, 0, 3, 2, 1, 2, 3, 1, 3, 0, 3, 3, 2, 1, 4, 2, 1, 2, 4, 2, 4, 0, 2, 4, 3, 1, 5, 3, 2, 2, 4, 2, 3, 2, 4, 5, 2, 0, 6, 2, 3, 3, 5, 3, 4, 2, 2, 5, 4, 0, 7, 3, 2, 4, 5, 4, 4, 0, 5, 6, 4, 1, 6, 4, 2, 4, 6, 2, 6, 2, 4, 5, 2, 3, 8, 6, 2, 3, 6, 2, 7, 0, 5, 8, 4
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,11
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..1000
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PROG
| (PARI) a(n)=sum(i=1, n, sum(j=1, i, sum(k=1, j, if(i*j+j*k+k*i-n, 0, 1))))
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CROSSREFS
| Sequence in context: A055652 A154844 A133831 * A089048 A184348 A192393
Adjacent sequences: A066952 A066953 A066954 * A066956 A066957 A066958
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KEYWORD
| nonn,easy
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AUTHOR
| Colin Mallows (colinm(AT)research.avayalabs.com) Jan 26 2002
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EXTENSIONS
| More terms from Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 02 2003
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