OFFSET
1,2
MATHEMATICA
a=1; b=2; lst={a, b}; Do[c=2*a*b-a; AppendTo[lst, c]; a=b; b=c, {n, 11}]; lst
RecurrenceTable[{a[1]==1, a[2]==2, a[n]==2a[n-2]a[n-1]-a[n-2]}, a, {n, 15}] (* Harvey P. Dale, Sep 10 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Joseph Stephan Orlovsky, Feb 09 2010
STATUS
approved