id:A055341 - OEIS Search Results

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Number of mobiles (circular rooted trees) with n nodes and 3 leaves.

+0
2

1, 3, 8, 19, 37, 66, 110, 172, 257, 371, 518, 705, 939, 1226, 1574, 1992, 2487, 3069, 3748, 4533, 5435, 6466, 7636, 8958, 10445, 12109, 13964, 16025, 18305, 20820, 23586, 26618, 29933, 33549, 37482, 41751, 46375, 51372, 56762, 62566, 68803 (list; graph; listen)

	OFFSET	`4,2`
	LINKS	`Index entries for sequences related to mobiles`
	FORMULA	`G.f.: x^4(-x^4+2x^3+x^2+1)/[(1-x^2)(1-x^3)(1-x)^3].`
	CROSSREFS	`Column 3 of A055340.` `Sequence in context: A139020 A086167 A083186 this_sequence A007326 A067332 A082535` `Adjacent sequences: A055338 A055339 A055340 this_sequence A055342 A055343 A055344`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), May 14 2000`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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