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A173099 a(1)=1, a(2)=3, a(n)=2*a(n-2)*a(n-1)-a(n-2)-a(n-1). 1
1, 3, 2, 7, 19, 240, 8861, 4244179, 75211087198, 638418558490509507, 96032307742263928939148386067, 122617614954666266094919182714589930973500782364 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

MATHEMATICA

a=1; b=3; lst={a, b}; Do[c=2*a*b-a-b; AppendTo[lst, c]; a=b; b=c, {n, 12}]; lst

CROSSREFS

Cf. A173093, A173094, A173096, A173097, A173098

Sequence in context: A177115 A316087 A196537 * A111928 A248054 A329421

Adjacent sequences:  A173096 A173097 A173098 * A173100 A173101 A173102

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Feb 09 2010

STATUS

approved

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Last modified January 19 17:59 EST 2020. Contains 331051 sequences. (Running on oeis4.)