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Search: id:A000763
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| A000763 |
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Number of interval orders constructed from n intervals of generic lengths. |
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+0
1
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| 1, 3, 19, 195, 2831, 53703, 1264467, 35661979, 1173865927, 44218244943, 1877050837355, 88693432799667, 4618194424504623, 262771389992099719, 16223185411792992403, 1080238361814167993739, 77171781603974127429527
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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E.g.f. E(x) satisfies E'/E = y^2, where y=1+x+5*x^2/2+... is defined by y(2-exp(xy))=1.
E.g.f.: exp(int(RootOf(2*_Z-_Z*exp(x*_Z)-1)^2, x)).
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CROSSREFS
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Cf. A052894.
Sequence in context: A048172 A053554 A079145 this_sequence A001832 A123681 A007151
Adjacent sequences: A000760 A000761 A000762 this_sequence A000764 A000765 A000766
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KEYWORD
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nonn,nice,easy
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AUTHOR
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R. P. Stanley [ rstan(AT)math.mit.edu ]
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EXTENSIONS
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More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 04 2001
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