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a(n) = s(n+3)/3, where s is A024961.
0

%I #3 Mar 30 2012 18:56:00

%S 2,4,11,28,68,169,470,1276,3395,9016,26240,74017,204590,568120,

%T 1659350,4770820,13538480,38435515,113673998,331360936,955040204,

%U 2757123412,8185543376,24071728150,70215321944,204746123776,612178795262,1813222985320

%N a(n) = s(n+3)/3, where s is A024961.

%K nonn

%O 1,1

%A _Clark Kimberling_