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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
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 }.
CROSSREFS
Sequence in context: A111373 A336757 A116376 * A102082 A358434 A030199
KEYWORD
nonn
AUTHOR
M. F. Hasler, Sep 26 2009
STATUS
approved