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 A165680 Triangle of the divisors of the coefficients of triangles A138771 and A165675 3
 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 6, 1, 1, 1, 2, 6, 24, 1, 1, 1, 2, 6, 24, 120, 1, 1, 1, 2, 6, 24, 120, 720, 1, 1, 1, 2, 6, 24, 120, 720, 5040, 1, 1, 1, 2, 6, 24, 120, 720, 5040, 40320, 1, 1, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,10 LINKS Table of n, a(n) for n=1..66. FORMULA a(n) = A138771(n)/A165675(n-1). EXAMPLE Triangle starts: 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 6, 1, 1, 1, 2, 6, 24, 1, 1, 1, 2, 6, 24, 120, 1, 1, 1, 2, 6, 24, 120, 720, 1, 1, 1, 2, 6, 24, 120, 720, 5040, 1, 1, 1, 2, 6, 24, 120, 720, 5040, 40320, 1, 1, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, ... MAPLE nmax:=11: for n from 1 to nmax do a(n, 1):=1 od: for n from 2 to nmax do for m from 2 to n do a(n, m):=(m-2)! od: od: for n from 1 to nmax do seq(a(n, m), m=1..n) od; CROSSREFS Cf. A138771, A165675 and A000142. A000012 (3x), A007395, A010722, A010863 equal the first six left hand columns. A159333 equals, for n=>-1, all right hand columns. A067078 equals the row sums. Sequence in context: A126886 A179272 A264753 * A248049 A231867 A105685 Adjacent sequences: A165677 A165678 A165679 * A165681 A165682 A165683 KEYWORD easy,nonn,tabl AUTHOR Johannes W. Meijer, Oct 05 2009 STATUS approved

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Last modified August 9 13:53 EDT 2024. Contains 375042 sequences. (Running on oeis4.)