A222556 - OEIS

A222556

Number of (n+2)X1 arrays of occupancy after each element moves up to +-n places but not 0

2, 20, 102, 427, 1668, 6372, 24230, 92279, 352596 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`Row 2 of A222555`
	LINKS	`Table of n, a(n) for n=1..9.`
	EXAMPLE	`Some solutions for n=3` `..1....3....0....0....2....0....0....2....1....2....0....0....3....2....1....1` `..3....0....0....1....0....2....0....1....1....1....1....3....0....0....0....0` `..0....1....3....0....2....1....4....1....1....0....2....0....0....3....4....3` `..0....1....1....1....1....1....0....1....2....1....0....1....2....0....0....0` `..1....0....1....3....0....1....1....0....0....1....2....1....0....0....0....1`
	CROSSREFS	`Sequence in context: A107483 A220856 A035599 * A103101 A267678 A009357` `Adjacent sequences: A222553 A222554 A222555 * A222557 A222558 A222559`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Feb 24 2013`
	STATUS	`approved`

Last modified May 28 09:09 EDT 2022. Contains 354112 sequences. (Running on oeis4.)