A066356 -id:A066356

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A064184

Denominator of sequence defined by recursion c(n)=1+c(n-2)/c(n-1), c(0)=0, c(1)=1.

+10
1

1, 1, 1, 1, 2, 3, 14, 69, 2338, 270825, 1546051598, 706593182981475, 2673049418728144394217734, 3191384003253515767044930785193578829525, 20884425143442468474684561246519089172344375280349724305463253298

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,5

LINKS

Table of n, a(n) for n=0..14.

FORMULA

a(n) = (a(n-1) * a(n-4) + a(n-2)^2) * a(n-2) /a(n-4).

a(n) = A066356(n-1) * a(n-2).

PROG

(PARI) {a(n) = if( n<4, n>=0, (a(n-1) * a(n-4) + a(n-2)^2) * a(n-2) / a(n-4))}

CROSSREFS

Cf. A066356.

KEYWORD

nonn,easy

AUTHOR

Michael Somos, Dec 21 2001

STATUS

approved

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