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

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

Crossrefs

Sequence in context: A278027 A225895 A089106 * A227555 A304278 A155603

Adjacent sequences: A211826 A211827 A211828 * A211830 A211831 A211832

Keyword

nonn

Author

R. H. Hardin Apr 21 2012

Status

approved