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 A125203 Number of ways to write n as 4*x*y - x - y with 1<=x<=y. 6
 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 2, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 2, 0, 0, 1, 0, 0, 2, 0, 0, 1, 0, 1, 1, 1, 0, 2, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0, 2, 0, 0, 2, 0, 0, 2, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 2, 0, 0, 2, 1, 0, 1, 0, 0, 1, 2, 0, 1, 0, 0, 2, 0, 1, 1, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,26 COMMENTS a(A094178(n))=0; a(A124934(n))>0; a(A125217(n))=1; a(A125218(n))>1. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 PROG (Haskell) a125203 n = length [() | x <- [1 .. (n + 1) `div` 3],                          let (y, m) = divMod (x + n) (4 * x - 1),                          x <= y, m == 0] -- Reinhard Zumkeller, Jan 02 2013 CROSSREFS Cf. A193773. Sequence in context: A309367 A122179 A335877 * A023565 A321925 A025922 Adjacent sequences:  A125200 A125201 A125202 * A125204 A125205 A125206 KEYWORD nonn AUTHOR Reinhard Zumkeller, Nov 24 2006 STATUS approved

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Last modified May 14 16:10 EDT 2021. Contains 343884 sequences. (Running on oeis4.)