A101268 - OEIS

The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

A101268

Number of compositions of n into pairwise relatively prime parts.

1, 1, 2, 4, 7, 13, 22, 38, 63, 101, 160, 254, 403, 635, 984, 1492, 2225, 3281, 4814, 7044, 10271, 14889, 21416, 30586, 43401, 61205, 85748, 119296, 164835, 226423, 309664, 422302, 574827, 781237, 1060182, 1436368, 1942589, 2622079, 3531152, 4742316, 6348411 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,3`
	LINKS	`Alois P. Heinz, Table of n, a(n) for n = 0..400` `Temba Shonhiwa, Compositions with pairwise relatively prime summands within a restricted setting, Fibonacci Quart. 44 (2006), no. 4, 316-323.`
	FORMULA	`It seems that no formula is known.`
	CROSSREFS	`Cf. A051424, A000740.` `Row sums of A282748.` `Sequence in context: A151897 A192758 A085489 * A188920 A281362 A319111` `Adjacent sequences: A101265 A101266 A101267 * A101269 A101270 A101271`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic, Dec 18 2004`
	EXTENSIONS	`a(0)=1 prepended by Alois P. Heinz, Jun 14 2017`
	STATUS	`approved`

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 17 09:32 EST 2020. Contains 330949 sequences. (Running on oeis4.)