A074056 a(n)=a(n-1)^3/a(n-2)^2+a(n-1)*a(n-2) with a(1)=a(2)=1.

1, 1, 2, 10, 270, 199530, 109021396230, 32547610062433062370530, 2900907183084129462928443491816490142071240030, 23044287863704114233982017840826804806870854633710605340763217534502946372713488874512819930

Offset

1,3

Links

Table of n, a(n) for n=1..10.

Formula

a(n) =a(n-1)*A057438(n) =A057438(n+2)-A057438(n+1)^2 and is about 0.365177806085453...*1.2292734309189943...^(2^n).

Example

a(5)=10^3/2^2+10*2=250+20=270.

Crossrefs

Partial products of A057438.

Sequence in context: A088310 A134473 A005154 * A206158 A144288 A215286

Adjacent sequences: A074053 A074054 A074055 * A074057 A074058 A074059

Keyword

nonn

Author

Henry Bottomley, Aug 14 2002

Status

approved