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 A165766 Number of tatami-free rooms of size 2n. 0
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 2, 0, 0, 1, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,99 COMMENTS Number of pairs (r,c) such that r<=c, r*c=2n and A068920(r,c)=0. A165632 lists twice the indices of nonzero terms, i.e. A165632 = { 2n | a(n)=0 }. LINKS Table of n, a(n) for n=1..105. CROSSREFS Sequence in context: A111373 A336757 A116376 * A102082 A358434 A030199 Adjacent sequences: A165763 A165764 A165765 * A165767 A165768 A165769 KEYWORD nonn AUTHOR M. F. Hasler, Sep 26 2009 STATUS approved

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Last modified September 10 06:17 EDT 2024. Contains 375773 sequences. (Running on oeis4.)