OFFSET
0,4
LINKS
John Cerkan, Table of n, a(n) for n = 0..21
MAPLE
a:= proc (n) option remember;
if n<2 then n
else a(n-1)*a(n-2) - 1
end if
end proc;
seq(a(n), n = 0..15); # G. C. Greubel, Sep 20 2019
MATHEMATICA
RecurrenceTable[{a[0]==0, a[1]==1, a[n]==a[n-1]*a[n-2] -1}, a, {n, 0, 15}] (* G. C. Greubel, Sep 20 2019 *)
PROG
(PARI) m=15; v=concat([0, 1], vector(m-2)); for(n=3, m, v[n]=v[n-1]*v[n-2] -1 ); v \\ G. C. Greubel, Sep 20 2019
(Magma) I:=[0, 1]; [n le 2 select I[n] else Self(n-1)*Self(n-2) -1: n in [1..15]]; // G. C. Greubel, Sep 20 2019
(Sage)
def a(n):
if (n<2): return n
else: return a(n-1)*a(n-2) -1
[a(n) for n in (0..15)] # G. C. Greubel, Sep 20 2019
(GAP) a:=[0, 1];; for n in [3..15] do a[n]:=a[n-1]*a[n-2] -1; od; a; # G. C. Greubel, Sep 20 2019
CROSSREFS
KEYWORD
easy,sign
AUTHOR
STATUS
approved