A211847 Number of nonnegative integer arrays of length n+13 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value 7.

1, 15, 149, 1173, 7996, 49210, 280751, 1510267, 7752966, 38313584, 183476493, 855810005, 3904023943, 17474944971, 76959615336, 334220597220, 1434013918092, 6088757186340, 25619291046722, 106954200571650, 443491592171780

Offset

1,2

Comments

Column 6 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....1....1....1....1....1....0....1....0....1....1....1....1
..1....1....1....1....1....1....1....0....1....1....0....1....1....1....0....1
..2....1....2....2....2....2....2....0....2....1....0....1....2....2....0....2
..2....2....2....2....2....2....2....2....2....1....2....2....2....2....2....2
..3....2....3....3....3....3....3....2....3....2....2....2....3....3....2....3
..2....3....3....3....3....3....3....3....3....2....2....3....3....2....3....3
..3....3....4....4....3....3....4....3....4....3....3....3....4....2....3....4
..3....4....4....4....4....3....4....4....4....3....3....4....4....4....4....3
..4....4....5....4....4....4....1....4....4....4....4....4....5....4....4....4
..4....5....5....5....5....4....1....4....5....4....4....4....4....5....5....4
..5....5....3....5....5....5....5....5....5....5....5....5....4....5....5....5
..5....5....3....5....6....5....5....5....6....5....5....5....6....6....6....5
..6....6....6....6....6....6....6....6....6....6....6....6....6....5....6....6
..6....6....6....6....6....6....6....6....6....6....6....6....7....5....7....6
..7....7....7....7....7....7....7....7....7....7....7....7....6....7....6....7

Crossrefs

Cf. A211849.

Sequence in context: A069417 A051272 A021414 * A055431 A119998 A119511

Adjacent sequences: A211844 A211845 A211846 * A211848 A211849 A211850

Keyword

nonn

Author

R. H. Hardin Apr 22 2012

Status

approved