%I #7 Mar 30 2012 18:35:07
%S 0,0,0,0,0,0,0,1,3,8,20,48,112,300,752,1712,3839,8507,18668,43437,
%T 98919,221527,478718,1027994,2196398,4811804,10446823,22508560,
%U 48207309,101582640,213430157,456774962,972054283
%N Number of subsets of { 1, ..., n } containing an A.P. of length 7.
%K nonn
%O 0,9
%A _David W. Wilson_
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