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%I #2 Feb 27 2009 03:00:00
%S 1,2,4,8,15,36,80,244,677,2530
%N Number of circular sequences of distinct positive integers between 1 and n such that the sum of any two consecutive elements is at least n+1.
%e For n=4 the circular sequences are 3, 4, 14, 23, 24, 34, 234 and 243, so a(4)=8.
%K nonn
%O 1,2
%A Daniel Gulotta (dgulotta(AT)mit.edu), Jun 18 2005