A221509 - OEIS

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A221509

Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction

0, 64, 664, 31663, 730874, 22664752, 617892584, 17782943460, 499912745268, 14194927933912, 401323009766448, 11367289765226164, 321716709992052606, 9108319376609834007, 257833317722010551358, 7299063007433073641077

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Row 3 of A221507

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Some solutions for n=3

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

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

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