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A229430 Number of ways to label the cells of a 2-by-n grid such that no (orthogonally) adjacent cells have adjacent labels 1
1, 0, 0, 24, 1660, 160524, 21914632, 4065598248, 987830372684 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..8.

EXAMPLE

The A(3) = 24 valid labelings of a 2-by-3 grid are

   153   163   135   513   415   416

   426   425   462   246   263   253

together with their 18 reflections and rotations

CROSSREFS

A(n) = A229429(2,n); cf. A002464

Sequence in context: A019284 A112389 A187634 * A054777 A301392 A084224

Adjacent sequences:  A229427 A229428 A229429 * A229431 A229432 A229433

KEYWORD

nonn,more

AUTHOR

Jens Voß, Sep 23 2013

STATUS

approved

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Last modified May 22 15:13 EDT 2019. Contains 323480 sequences. (Running on oeis4.)