|
Search: id:A051181
|
|
|
| A051181 |
|
Number of 4-element intersecting families of an n-element set. |
|
+0
6
|
|
| 0, 0, 0, 4, 365, 11770, 278455, 5715094, 108498285, 1963243930, 34404675635, 589459538734, 9933916068505, 165358097339890, 2726894329246815, 44648990949187174
(list; graph; listen)
|
|
|
OFFSET
|
0,4
|
|
|
REFERENCES
|
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).
|
|
FORMULA
|
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)
|
|
CROSSREFS
|
Cf. A036239, A051180-A051185.
Sequence in context: A052391 A051955 A109760 this_sequence A038015 A003753 A006237
Adjacent sequences: A051178 A051179 A051180 this_sequence A051182 A051183 A051184
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Vladeta Jovovic, Goran Kilibarda (vladeta(AT)Eunet.yu)
|
|
|
Search completed in 0.005 seconds
|
