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 A222556 Number of (n+2)X1 arrays of occupancy after each element moves up to +-n places but not 0 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: A356344 A220856 A035599 * A103101 A267678 A009357 Adjacent sequences: A222553 A222554 A222555 * A222557 A222558 A222559 KEYWORD nonn AUTHOR R. H. Hardin Feb 24 2013 STATUS approved

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Last modified February 25 17:53 EST 2024. Contains 370332 sequences. (Running on oeis4.)