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A144646
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a(n) = Bell(n) - 2^n + n.
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1
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0, 0, 0, 0, 3, 25, 145, 756, 3892, 20644, 114961, 676533, 4209513, 27636258, 190882952, 1382925792, 10480076627, 82864738749, 682076544033, 5832741680788, 51724157186816, 474869814059620, 4506715734253041, 44152005846695761, 445958869278028097
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,5
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COMMENTS
| Number of partitions of an n-set having more than one block of size > 1.
- Peter Luschny, Apr 10 2011
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EXAMPLE
| a(5) = 25 = card({25|134, 35|124, 125|34, 345|12, 45|123, 235|14, 15|234, 145|23, 135|24, 245|13, 25|4|13, 35|4|12, 45|3|12, 5|24|13, 5|12|34, 1|35|24, 35|2|14, 25|3|14, 5|14|23, 1|45|23, 15|4|23, 45|2|13, 15|3|24, 15|2|34, 1|25|34}). - Peter Luschny, Apr 10 2011
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CROSSREFS
| Cf. A000110, A094782.
Sequence in context: A099868 A112495 A034578 * A000544 A037776 A037664
Adjacent sequences: A144643 A144644 A144645 * A144647 A144648 A144649
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KEYWORD
| nonn
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AUTHOR
| Jean-Yves Tallet (jean-yves.tallet(AT)club-internet.fr) and N. J. A. Sloane (njas(AT)research.att.com), Jan 26 2009
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