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A053618
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Ceiling(C(n,4)/n).
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5
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0, 0, 0, 1, 1, 3, 5, 9, 14, 21, 30, 42, 55, 72, 91, 114, 140, 170, 204, 243, 285, 333, 385, 443, 506, 575, 650, 732, 819, 914, 1015, 1124, 1240, 1364, 1496, 1637, 1785, 1943, 2109, 2285, 2470, 2665, 2870, 3086, 3311, 3548, 3795, 4054, 4324
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,6
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REFERENCES
| R. L. Graham and N. J. A. Sloane, Lower bounds for constant weight codes, IEEE Trans. Inform. Theory, 26 (1980), 37-43.
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MAPLE
| seq(ceil(binomial(n, 3)/4), n=0..52); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 12 2009]
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CROSSREFS
| Cf. A007997, A008646, A053643, A032192, A053731, A053733.
Sequence in context: A054066 A081946 A166709 * A032801 A033818 A120452
Adjacent sequences: A053615 A053616 A053617 * A053619 A053620 A053621
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mar 25 2000
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