A145273 - OEIS

%I #2 Oct 12 2013 15:24:51

%S 1,0,1,0,0,1,1,0,0,0,0,1,1,0,1,0,0,0,1,1,1,0,0,1,1,0,1,0,0,0,1,1,0,0,

%T 0,1,0,0,0,1,0,0,0,1,0,1,1,0,1,1,0,1,0,0,0,1,0,0,0,1,1,1,1,0,0,1,1,1,

%U 0,0,1,1,0,0,1,1,1,0,1,0,1,1,0,0,0,0,0,0,0,0,0,1,0,1,0,1,0,1

%N Parity sequence of A006893.

%C Complement of the parity sequence of iterated triangular numbers (A117872).

%Y Cf. A145272. Complement of A117872

%K easy,nonn

%O 1,1

%A _Greg Huber_, Oct 06 2008