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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
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 21 2012
STATUS
approved