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A079520
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Triangular array related to tennis ball problem, read by rows.
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1
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0, 0, 1, 0, 1, 3, 0, 1, 4, 10, 0, 1, 5, 15, 31, 0, 1, 6, 21, 52, 105, 0, 1, 7, 28, 80, 185, 343
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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COMMENTS
| Rows have been reversed.
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REFERENCES
| D. Merlini, R. Sprugnoli and M. C. Verri, The tennis ball problem, J. Combin. Theory, A 99 (2002), 307-344 (Fig. A.3).
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EXAMPLE
| 0; 0,1; 0,1,3; 0,1,4,10; ...
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CROSSREFS
| Leading diagonal gives A079522.
Sequence in context: A124323 A106683 A139601 * A191532 A179552 A119879
Adjacent sequences: A079517 A079518 A079519 * A079521 A079522 A079523
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KEYWORD
| nonn,tabl
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jan 22 2003
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