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%I #3 Mar 30 2012 18:55:59
%S 1,1,1,7,13,19,61,145,301,745,1729,4447,10585,25327,62569,156049,
%T 382513,928369,2288329,5862367,14587717,35951587,90006229,231398497,
%U 580975885,1450005841,3655134145,9449479159,23897176753,60127243687,152755139617
%N a(n) = s(n+3)/6, where s is A024731.
%K nonn
%O 1,4
%A _Clark Kimberling_
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