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A052390
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Number of 4-element intersecting families (with not necessary distinct sets) whose union is an n-element set.
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0
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1, 7, 71, 956, 15116, 254397, 4318511, 72331966, 1188180386, 19152566087, 303768582701, 4755204310776, 73675434833456, 1132450098258577, 17301032324486891, 263098797953058386, 3987051131522775326
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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).
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FORMULA
| 1/4!*(15^n-6*11^n+12*9^n-8^n-10*7^n+15*6^n-24*5^n+19*4^n+5*3^n-11*2^n+6)
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CROSSREFS
| Cf. A051181, A053156, A053157.
Sequence in context: A065537 A048552 A067307 * A002119 A146752 A022518
Adjacent sequences: A052387 A052388 A052389 * A052391 A052392 A052393
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KEYWORD
| nonn
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AUTHOR
| Vladeta Jovovic, Goran Kilibarda (vladeta(AT)eunet.rs), Mar 11 2000
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