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Search: id:A099950
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| A099950 |
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Number of 2-sparse nonoverlapping partitions of n. |
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+0
1
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| 1, 1, 1, 2, 4, 10, 27, 80, 255, 870, 3155, 12100, 48871, 207162, 918944, 4254690, 20513838, 102784942, 534205629, 2875098840, 15999114433, 91923562922, 544606671776, 3323112062994, 20860869818386, 134585869671342
(list; graph; listen)
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OFFSET
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0,4
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REFERENCES
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M. Klazar, Bell numbers, their relatives, and algebraic differential equations, J. Combin. Theory, A 102 (2003), 63-87.
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LINKS
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M. Klazar, Bell numbers, their relatives, and algebraic differential equations
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PROGRAM
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(PARI) {a(n)=local(A); if(n<0, 0, A=O(x^0); for(i=0, n\2, A=(1+x)/(1-x^2*subst(A, x, x/(1-x)))); polcoeff(A, n))} /* Michael Somos Sep 22 2005 */
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CROSSREFS
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Sequence in context: A108523 A114507 A127386 this_sequence A121690 A138356 A057786
Adjacent sequences: A099947 A099948 A099949 this_sequence A099951 A099952 A099953
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KEYWORD
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nonn,easy
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AUTHOR
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njas, Nov 12 2004
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