A064185 a(n) = (b(n+3) * b(n-1) * a(n-1)^2 - 1) / b(n+2) where b(n) = A006720(n).

1, 1, 1, 2, 13, 867, 12001543, 4909644519038939, 2976533007674072187623474816337374, 5305128832761583696023807632374530398637482018663107882637653612424699

Offset: 0

Author

Michael Somos, Sep 20 2001

Keywords

• nonn
• easy

Crossrefs

Cf. A006720.

Programs

PARI

{a(n) = if( n<1, n>=0, (b(n+3) * b(n-1) * a(n-1)^2 - 1) / b(n+2))}