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A217886 Number of n element 1..n arrays with each element the minimum of 3 adjacent elements of a permutation of 1..n+2 of n+2 elements 0
1, 3, 11, 44, 192, 892, 4400, 23086, 129250, 773868, 4953208, 33778104, 244102608, 1858257232, 14822495192 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A217891

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A151108 A256752 A018963 * A234627 A030815 A030880

Adjacent sequences:  A217883 A217884 A217885 * A217887 A217888 A217889

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 14 2012

STATUS

approved

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Last modified February 22 16:40 EST 2019. Contains 320399 sequences. (Running on oeis4.)