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 A216601 Number of ways to write n as a product with all factors <= n/5. 7
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 2, 1, 0, 1, 0, 0, 2, 0, 3, 0, 0, 1, 4, 0, 0, 0, 3, 0, 2, 0, 0, 2, 0, 0, 7, 1, 2, 0, 0, 0, 4, 1, 3, 0, 0, 0, 6, 0, 0, 2, 7, 1, 2, 0, 0, 0, 3, 0, 11, 0, 0, 2, 0, 1, 2, 0, 8, 3, 0, 0, 6, 1, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,24 COMMENTS a(n) = A066032(n,floor(n/5)) for n > 4. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..1000 EXAMPLE a(50) = #{10*2, 5*5*2} = 2; a(51) = #{} = 0; a(52) = #{} = 0; a(53) = #{} = 0; a(54) = #{9*6, 9*3*2, 6*3*3, 3*3*3*2} = 4; a(55) = #{11*5} = 1. PROG (Haskell) a216601 n | n <= 4    = 0           | otherwise = a066032_tabl !! (n-1) !! (n `div` 5 - 1) CROSSREFS Cf. A001055, A028422, A216599, A216600, A216602. Sequence in context: A115604 A128617 A116488 * A283000 A145765 A157424 Adjacent sequences:  A216598 A216599 A216600 * A216602 A216603 A216604 KEYWORD nonn AUTHOR Reinhard Zumkeller, Oct 01 2012 STATUS approved

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Last modified August 20 22:45 EDT 2019. Contains 326155 sequences. (Running on oeis4.)