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A200150 Number of 0..4 arrays x(0..n-1) of n elements with zero n-1st difference 0
1, 5, 13, 41, 103, 275, 685, 2525, 5221, 13897, 32717, 176145, 321963, 1390895, 2223445, 3845743, 10539177, 76756525, 147653093, 808935605, 934179307 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A200154

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Some solutions for n=6

..1....1....4....1....2....1....2....4....2....1....1....0....2....1....4....3

..2....0....1....1....1....2....1....0....1....4....1....2....3....4....1....2

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

..2....4....2....4....3....4....1....4....2....0....4....1....3....2....2....2

..2....4....1....1....1....4....1....4....3....2....3....2....1....2....3....0

..1....1....4....1....2....1....2....4....2....1....1....0....2....1....4....3

CROSSREFS

Sequence in context: A080267 A034735 A305464 * A287017 A229747 A182300

Adjacent sequences:  A200147 A200148 A200149 * A200151 A200152 A200153

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 13 2011

STATUS

approved

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Last modified November 17 13:12 EST 2019. Contains 329230 sequences. (Running on oeis4.)