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A005451 Define b(n) = ( (n-1)*(n^2-3*n+1)*b(n-1) - (n-2)^3*b(n-2) )/(n*(n-3)); b(2) = b(3) = 1; sequence gives denominators of b(n). 3
1, 1, 4, 1, 6, 1, 8, 9, 10, 1, 12, 1, 14, 15, 16, 1, 18, 1, 20, 21, 22, 1, 24, 25, 26, 27, 28, 1, 30, 1, 32, 33, 34, 35, 36, 1, 38, 39, 40, 1, 42, 1, 44, 45, 46, 1, 48, 49, 50, 51, 52, 1, 54, 55, 56, 57, 58, 1, 60 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

LINKS

Table of n, a(n) for n=2..60.

Achilleas Sinefakopoulos, Problem 10578 Submitted solution.

H. S. Wilf, Problem 10578, Amer. Math. Monthly, 104 (1997), 270.

CROSSREFS

Cf. A005450 (numerators).

Sequence in context: A326478 A324118 A100796 * A135683 A113520 A232597

Adjacent sequences:  A005448 A005449 A005450 * A005452 A005453 A005454

KEYWORD

nonn,frac

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified April 10 23:57 EDT 2021. Contains 342877 sequences. (Running on oeis4.)