id:A106179 - OEIS Search Results

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Triangle of coefficients arising in connection with enumeration of series-reduced planted trees by number of endpoints.

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1, 1, 1, 1, 2, 2, 1, 3, 5, 3, 1, 4, 10, 12, 6, 1, 5, 16, 29, 28, 11, 1, 6, 24, 57, 84, 66, 23, 1, 7, 33, 99, 192, 231, 157, 46 (list; table; graph; listen)

	OFFSET	`2,5`
	REFERENCES	`J. Riordan, The blossoming of Schroeder's fourth problem, Acta Math., 137 (1976), 1-16.`
	EXAMPLE	`Triangle begins:` `1` `1 1` `1 2 2` `1 3 5 3` `1 4 10 12 6` `1 5 16 29 28 11`
	CROSSREFS	`Right diagonal is A001190. Row sums give A000669.` `Adjacent sequences: A106176 A106177 A106178 this_sequence A106180 A106181 A106182` `Sequence in context: A060850 A038137 A073133 this_sequence A081572 A106196 A037027`
	KEYWORD	`nonn,tabl`
	AUTHOR	`njas, May 29 2005`

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Last modified October 6 16:13 EDT 2008. Contains 144667 sequences.

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