A064184 Denominator of sequence defined by recursion c(n)=1+c(n-2)/c(n-1), c(0)=0, c(1)=1.

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

Offset: 0

Author

Michael Somos, Dec 21 2001

Keywords

• nonn
• easy

Crossrefs

Cf. A066356.

Programs

PARI

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

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).