id:A128526 - OEIS Search Results

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Number of 4-indecomposable (connected) graphs on n nodes.

+0
4

1, 1, 1, 2, 6, 21, 112, 853, 111, 181, 323, 437, 717, 1198, 1606, 2454, 3782, 4997, 7245, 10543, 13711, 19092, 26612, 34076, 45948, 61930, 78154, 102654, 134670, 167688, 215496, 276480, 340080, 429030, 540246, 657162, 815994, 1011264, 1217712, 1491336, 1822920, 2174898, 2631618, 3178230, 3760086, 4501332, 5378868, 6314748, 7487964, 8863635 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`See A124593 for definition.`
	FORMULA	`G.f.: x/((1-x)(1-x^2)^2(1-x^3)^8) + 1 - x^3 - 5x^4 + 7x^5 + 82x^6 + 783x^7 + 17x^8 + 10x^9.`
	CROSSREFS	`Cf. A126099, A128527, A128528` `Sequence in context: A156808 A076324 A076325 this_sequence A076326 A076327 A076328` `Adjacent sequences: A128523 A128524 A128525 this_sequence A128527 A128528 A128529`
	KEYWORD	`nonn`
	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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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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