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A138778
Triangle read by rows: T(n,k)=k*binomial(n-2k,3k) (n>=5, 1<=k<=n/5).
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1, 4, 10, 20, 35, 56, 2, 84, 14, 120, 56, 165, 168, 220, 420, 286, 924, 3, 364, 1848, 30, 455, 3432, 165, 560, 6006, 660, 680, 10010, 2145, 816, 16016, 6006, 4, 969, 24752, 15015, 52, 1140, 37128, 34320, 364
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 20 13:54 EST 2009. Contains 171081 sequences.
AT&T Labs Research
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