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A128528
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Number of 6-indecomposable (connected) graphs on n nodes.
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3
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1, 1, 1, 2, 6, 21, 112, 853, 11117, 261080, 11716571, 1006700565, 164159, 422662, 1295037, 4272969, 12780650, 23303620, 64379033, 189490870, 556338383, 1448500351, 2871171041, 7624849834, 20914847051, 55714746424, 133364472272, 277569288280, 708402263349, 1827946074290, 4530654263579, 10312511072061, 22005420425661, 54057174050076, 132409684714581
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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COMMENTS
| See A124593 for definition.
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FORMULA
| G.f.: x/((1-x)*(1-x^2)^2*(1-x^3)^8*(1-x^4)^44*(1-x^5)^333) + 1 - x^3 - 5*x^4 - 37*x^5 - 295*x^6 + 318*x^7 + 9540*x^8 + 255640*x^9 + 11694624*x^10 + 1006613825*x^11 + 25539*x^12 + 25593*x^13 + 30877*x^14 + 34220*x^15
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CROSSREFS
| Cf. A126099, A128526, A128527
Sequence in context: A076327 A076328 A128527 * A001349 A126060 A110306
Adjacent sequences: A128525 A128526 A128527 * A128529 A128530 A128531
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KEYWORD
| nonn
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AUTHOR
| David Applegate (david(AT)research.att.com) and N. J. A. Sloane (njas(AT)research.att.com), Mar 07 2007
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