OFFSET
0,5
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
KEYWORD
nonn,easy
AUTHOR
Michael Somos, Dec 21 2001
STATUS
approved