OFFSET
0,1
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
FORMULA
a(n) = 2*a(n-1) - a(n-2) + a(n-4) - a(n-5) (holds at least up to n = 1000 but is not known to hold in general).
MATHEMATICA
RecurrenceTable[{a[0] == 9, a[1] == 10, a[n] == Ceiling[a[n - 1]^2/a[n - 2]]}, a, {n, 0, 50}] (* Bruno Berselli, Feb 04 2016 *)
PROG
(Magma) Lxy:=[9, 10]; [n le 2 select Lxy[n] else Ceiling(Self(n-1)^2/Self(n-2)): n in [1..50]]; // Bruno Berselli, Feb 04 2016
(PARI) pisotL(nmax, a1, a2) = {
a=vector(nmax); a[1]=a1; a[2]=a2;
for(n=3, nmax, a[n] = ceil(a[n-1]^2/a[n-2]));
a
}
pisotL(50, 9, 10) \\ Colin Barker, Aug 07 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved