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A263598 Number of (n+1)X(1+1) arrays of permutations of 0..n*2+1 filled by rows with each element moved a city block distance of 0 or 2, and rows and columns in increasing lexicographic order. 1
2, 8, 24, 60, 160, 448, 1232, 3344, 9120, 24960, 68224, 186304, 508928, 1390592, 3799296, 10379520, 28357120, 77473792, 211662848, 578272256, 1579868160, 4316282880, 11792306176, 32217174016, 88018952192, 240472260608 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A263602.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 2*a(n-1) +4*a(n-3) +4*a(n-4)

EXAMPLE

Some solutions for n=4

..0..2....0..2....0..2....0..2....0..1....0..1....0..2....0..2....0..5....0..1

..1..7....1..3....1..3....1..4....2..4....2..3....1..7....1..4....2..3....2..7

..3..5....4..6....4..5....3..5....3..6....4..5....3..9....3..9....4..1....3..9

..6..4....5..7....6..7....6..7....5..8....6..7....6..4....5..8....6..7....5..4

..8..9....8..9....8..9....8..9....7..9....8..9....8..5....7..6....8..9....8..6

CROSSREFS

Cf. A263602.

Sequence in context: A051745 A006734 A131064 * A075218 A006728 A234933

Adjacent sequences:  A263595 A263596 A263597 * A263599 A263600 A263601

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 22 2015

STATUS

approved

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Last modified September 22 08:23 EDT 2018. Contains 315270 sequences. (Running on oeis4.)