A129838 - OEIS

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A129838

Number of alternating compositions of n into distinct parts.

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; refs; listen; history; internal format)

	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.rs), May 24 2007`
	CROSSREFS	`Cf. A025048, A025049, A000111, A032020.` `Sequence in context: A178927 A076571 A084783 * A032153 A116465 A117356` `Adjacent sequences: A129835 A129836 A129837 * A129839 A129840 A129841`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), May 21 2007`

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Last modified February 23 08:10 EST 2012. Contains 206628 sequences.