id:A129838 - OEIS Search Results

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Number of alternating compositions of n into distinct parts.

+0
1

1, 1, 2, 2, 3, 5, 6, 8, 11, 18, 21, 30, 38, 52, 78, 97, 128, 170, 222, 285, 421, 510, 683, 872, 1148, 1440, 1893, 2576, 3209, 4151, 5313, 6784, 8615, 10969, 13755, 18573, 22713, 29173, 36536, 46705, 57899, 73696, 91076, 114777, 148531, 182813, 228938 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`G.f.: Sum_{k=1..inf} A000111(k)x^(k(k+1)/2)/Product_{i=1..k}(1-x^i). - Vladeta Jovovic (vladeta(AT)Eunet.yu), May 24 2007`
	CROSSREFS	`Cf. A025048, A025049, A000111, A032020.` `Adjacent sequences: A129835 A129836 A129837 this_sequence A129839 A129840 A129841` `Sequence in context: A118399 A076571 A084783 this_sequence A032153 A116465 A117356`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), May 21 2007`

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Last modified October 6 12:54 EDT 2008. Contains 144667 sequences.

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