%I #3 Mar 30 2012 16:49:43
%S 0,1,2,3,4,3,4,5,6,7,6,7,8,9,10,9,10,9,10,11,10,11,10,11,12,13,14,13,
%T 14,15,16,17,16,17,16,17,18,17,18,17,18,19,20,21,20,21,22,23,24,23,24,
%U 23,24,23,22,23,22,23,22,23,22,23,22,21,22,21,22,21,22,23,24
%N (A081746(n) - n)/4.
%F Periodic with period 648.
%Y Cf. A081746, A081747.
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Apr 08 2003