OFFSET
0,4
LINKS
Ivan Panchenko, Table of n, a(n) for n = 0..200
FORMULA
a(0)=0, a(1)=1, a(n) = a(n-1) XOR (a(n-2)*3), where XOR is the bitwise exclusive-OR operator.
PROG
(Python)
prpr = 0
prev = 1
for i in range(99):
current = (prev)^(prpr*3)
print(prpr, end=', ')
prpr = prev
prev = current
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Alex Ratushnyak, May 07 2012
STATUS
approved