A124921 - OEIS

This site is supported by donations to The OEIS Foundation.

A124921

Distributes the number of permutations in the alternating group; cf. A060351 (both TABf sequences have shape A11782).

1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 3, 1, 1, 3, 1, 1 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,11`
	COMMENTS	`The symmetric group distribution of permutation descents is summarized in Table A008292; for example 1 57 302 302 57 1 sums the following A060351 values:` `1.......5.......10.......10.......5.......1` `.......14.......35.......35.......14.......` `.......19.......26.......40.......19.......` `.......14.......40.......19.......14.......` `........5.......61.......26.......5.......` `................26.......61..............` `................19.......40..............` `................40.......26..............` `................35.......35..............` `................10.......10..............`
	EXAMPLE	`The distribution is based on the frequency of descents; for example,` `when permuting four symbols the 12 patterns are ddd ddu dud udu dud duu` `udd udu dud udu uud and uuu yielding the frequency distribution 1 1 3 1 1 3 1 1`
	CROSSREFS	`Cf. A001710, A008292, A060351.` `Sequence in context: A016564 A104443 A103496 * A076498 A110268 A058965` `Adjacent sequences: A124918 A124919 A124920 * A124922 A124923 A124924`
	KEYWORD	`more,nonn,uned`
	AUTHOR	`Alford Arnold (Alford1940(AT)aol.com), Nov 16 2006`

Content is available under The OEIS End-User License Agreement .

Last modified February 14 14:07 EST 2012. Contains 205623 sequences.