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A171076
Total number of balls in room in variant of the tennis ball problem (cf. A171074);
1
2, 20, 188, 1222, 6872, 35954, 180070
OFFSET
1,1
COMMENTS
Apparently equals A051133(n) - A090288(n-1) 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.
CROSSREFS
Sequence in context: A037566 A125857 A226312 * A287999 A348886 A001078
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 06 2010
STATUS
approved