A211844 Number of nonnegative integer arrays of length n+7 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value 4

1, 9, 56, 286, 1302, 5486, 21897, 84003, 312864, 1139408, 4079404, 14417732, 50465519, 175400683, 606660198, 2091805472, 7201476498, 24786314450, 85384391951, 294672813537, 1019666296658, 3540327824374, 12341347668900

Offset

1,2

Comments

Column 3 of A211849

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

Crossrefs

Sequence in context: A203838 A097556 A196861 * A172065 A002055 A026842

Adjacent sequences: A211841 A211842 A211843 * A211845 A211846 A211847

Keyword

nonn

Author

R. H. Hardin Apr 22 2012

Status

approved