A171075 Total number of balls on lawn in variant of the tennis ball problem (cf. A171074).

1, 20, 190, 1226, 6878, 35962, 180080

Offset: 1

Author

N. J. A. Sloane, Sep 06 2010

Keywords

• nonn

Comments

Apparently equals A051133(n) - A005893(n) after 1st term.

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.

References

• David Scambler, Just for fun, more tennis balls, Posting to the Sequence Fans Mailing List, Aug 25 2010.