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(A081746(n) - n)/4.
2

%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