%I #2 Mar 30 2012 16:51:55
%S 1,20,190,1226,6878,35962,180080
%N Total number of balls on lawn in variant of the tennis ball problem (cf. A171074);
%C Apparently equals A051133(n) - A005893(n) after 1st term.
%C Note that A051133 yields the totals of all C(2n, n) ball sets and A005893 and A090288 are the respective totals of impossible combinations given the rules.
%D David Scambler, Just for fun, more tennis balls, Posting to the Sequence Fans Mailing List, Aug 25 2010.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Sep 06 2010
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