A211829 - OEIS

A211829

Number of nonnegative integer arrays of length n+2 with new values 0 upwards introduced in order, no three adjacent elements equal, and containing the value 2

1, 7, 33, 146, 664, 3199, 16479, 90774, 532870, 3319142, 21844498, 151329352, 1099821989, 8361242674, 66320784806, 547602705993, 4697109617699, 41777867535655, 384671271441332, 3661037447438874, 35965775221693131

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OFFSET

1,2

COMMENTS

Column 1 of A211836

LINKS

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

EXAMPLE

Some solutions for n=3

..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0

..1....1....1....1....1....1....1....1....1....1....1....1....1....1....0....1

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