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A108798
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Number of nonisomorphic systems enumerated by A102894; that is, the number of inequivalent closure operators in which the empty set is closed.
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7
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OFFSET
| 0,3
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CROSSREFS
| Equals (1/2)*A108800(n).
Cf. A102894, A102895, A102897, A193674, A108800, A193675.
Sequence in context: A185238 A090897 A120459 * A132490 A058388 A081383
Adjacent sequences: A108795 A108796 A108797 * A108799 A108800 A108801
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KEYWORD
| nonn,more
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AUTHOR
| D. E. Knuth, Jul 01, 2005
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EXTENSIONS
| a(6) added using A193674. - N. J. A. Sloane, Aug 02 2011
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