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Search: id:A051181
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| A051181 |
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Number of 4-element intersecting families of an n-element set. |
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+0
6
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| 0, 0, 0, 4, 365, 11770, 278455, 5715094, 108498285, 1963243930, 34404675635, 589459538734, 9933916068505, 165358097339890, 2726894329246815, 44648990949187174
(list; graph; listen)
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OFFSET
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0,4
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REFERENCES
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V. Jovovic, G. Kilibarda, On the number of Boolean functions in the Post classes F^{mu}_8, Diskretnaya Matematika, 11 (1999), no. 4, 127-138 (translated in Discrete Mathematics and Applications, 9, (1999), no. 6).
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FORMULA
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1/4!(16^n-6*12^n+12*10^n-9^n-22*8^n+15*7^n+12*6^n-17*5^n+17*4^n-11*3^n-6*2^n+6)
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CROSSREFS
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Cf. A036239, A051180-A051185.
Sequence in context: A052391 A051955 A109760 this_sequence A154682 A154569 A038015
Adjacent sequences: A051178 A051179 A051180 this_sequence A051182 A051183 A051184
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KEYWORD
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nonn
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AUTHOR
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Vladeta Jovovic, Goran Kilibarda (vladeta(AT)eunet.rs)
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