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A119932 Triangle of denominators of the cube of a certain lower triangular matrix. 5
1, 8, 8, 108, 108, 27, 576, 576, 576, 64, 18000, 18000, 18000, 2000, 125, 21600, 21600, 21600, 21600, 5400, 216, 1234800, 1234800, 1234800, 1234800, 308700, 12348, 343, 5644800, 5644800, 5644800, 5644800 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The triangle of the corresponding numerators is A119935.

See a comment under A119935 on the relation to the triangle A027447.

LINKS

Table of n, a(n) for n=1..32.

W. Lang: First ten rows and rationals.

FORMULA

a(i,j)= denominator(r(i,j)) with r(i,j):=(A^3)[i,j], where the lower triangular matrix A has elements a[i,j] = 1/i if j<=i, 0 if j>i.

CROSSREFS

a(i, j)=1/A002024(i, j), i>=1, j<=i.

Row sums give A119933. Row sums of the triangle of rationals are identical 1.

Sequence in context: A286068 A228071 A192386 * A270118 A270150 A065241

Adjacent sequences:  A119929 A119930 A119931 * A119933 A119934 A119935

KEYWORD

nonn,easy,tabl,frac

AUTHOR

Wolfdieter Lang, Jul 20 2006

STATUS

approved

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Last modified March 21 20:16 EDT 2019. Contains 321382 sequences. (Running on oeis4.)