A134799 - OEIS

login

The OEIS is supported by the many generous donors to the OEIS Foundation.

A134799

a(n)=3^((3^n - 1)/2).

0

1, 3, 81, 1594323, 12157665459056928801 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,2`
	COMMENTS	`Number of partitions into "bus routes" of the graph G_{n+1} defined below.`
	LINKS	`Table of n, a(n) for n=0..4.` `Author?, Mitsumata tree`
	EXAMPLE	`.........\|..................G_1` `**` `.......__\|__................G_2` `.........\|` `` `.__\|_____\|_____\|__..........G_3` `...\|.....\|.....\|` `.........\|` `.......__\|__` `.........\|` `.` `..._\|_........._\|_..........G_4` `_\|__\|_____\|_____\|__\|_` `.\|._\|_....\|...._\|_.\|` `....\|.....\|.....\|` `......_\|__\|__\|_` `.......\|._\|_.\|` `..........\|` `**` `G_1 = o---. = rooted tree with one edge and one leaf node. For n > 0, G_{n+1} is obtained from G_n by splitting each leaf node into three.`
	CROSSREFS	`Cf. A131709` `Sequence in context: A060722 A183502 A325053 * A055590 A037111 A067202` `Adjacent sequences: A134796 A134797 A134798 * A134800 A134801 A134802`
	KEYWORD	`nonn,easy`
	AUTHOR	`Yasutoshi Kohmoto, Jan 09 2008`
	EXTENSIONS	`Edited by N. J. A. Sloane, Jan 29 2008`
	STATUS	`approved`

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 26 13:17 EDT 2022. Contains 354092 sequences. (Running on oeis4.)