0,2

This is one of the "twin" ratio-determined insertion sequences (RDIS) that are "children" in the next generation below the "parent" sequences I(0.25024) (A004253) and I(0.26816) (A001353) in the recurrence tree of RDIS sequences. The RDIS twin of this sequence is A085349. See the link for an explanation of RDIS twin. See A082630 or A082981 for other recent examples of RDIS sequences.

John W. Layman, Ratio-Determined Insertion Sequences and the Tree of their Recurrence Types

It appears that a(n)=18a(n-2)-a(n-4).

Apparently a(n)a(n+3) = -4 + a(n+1)a(n+2). - R. Stephan, May 29 2004

Cf. A001353, A004253, A082630, A082981, A085349.

Sequence in context: A129019 A167247 A027208 this_sequence A027232 A110688 A009450

Adjacent sequences: A085345 A085346 A085347 this_sequence A085349 A085350 A085351

nonn

John W. Layman (layman(AT)math.vt.edu), Jun 24 2003