A211830 Number of nonnegative integer arrays of length n+3 with new values 0 upwards introduced in order, no three adjacent elements equal, and containing the value 3

1, 11, 77, 461, 2621, 14862, 86295, 520534, 3285279, 21751723, 151075466, 1099127680, 8359344687, 66315597630, 547588531486, 4697070887568, 41777761715433, 384670982322915, 3661036657532939, 35965773063598059

Offset

1,2

Comments

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

Crossrefs

Sequence in context: A320547 A022639 A000589 * A322877 A226708 A206529

Adjacent sequences: A211827 A211828 A211829 * A211831 A211832 A211833

Keyword

nonn

Author

R. H. Hardin Apr 21 2012

Status

approved