A211831 Number of nonnegative integer arrays of length n+4 with new values 0 upwards introduced in order, no three adjacent elements equal, and containing the value 4

1, 16, 157, 1254, 9068, 62617, 426022, 2913894, 20307833, 145503003, 1077731960, 8277491943, 66003259942, 546398875027, 4692545543444, 41760563809046, 384605668021029, 3660788725969481, 35964832246977675, 364242679197958081

Offset

1,2

Comments

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

Crossrefs

Sequence in context: A184598 A258460 A320548 * A036973 A101931 A220630

Adjacent sequences: A211828 A211829 A211830 * A211832 A211833 A211834

Keyword

nonn

Author

R. H. Hardin Apr 21 2012

Status

approved