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A268957
Number of length-(n+3) 0..n arrays with no repeated value equal to the previous repeated value, with new values introduced in sequential order.
1
5, 29, 138, 634, 3045, 15579, 85314, 498408, 3092383, 20286281, 140153290, 1016261974, 7710988251, 61062381647, 503482376776, 4313580705556, 38328590370571, 352618807558797, 3353663977088616, 32927374589861042
OFFSET
1,1
COMMENTS
Subdiagonal 3 of A268956.
LINKS
EXAMPLE
Some solutions for n=7
..0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0. .0
..1. .1. .0. .1. .1. .1. .1. .0. .0. .1. .1. .1. .1. .1. .1. .0
..2. .2. .1. .1. .2. .2. .2. .1. .1. .2. .0. .2. .2. .2. .2. .1
..3. .3. .2. .0. .3. .2. .0. .2. .2. .3. .0. .3. .2. .0. .1. .2
..0. .3. .3. .2. .4. .3. .3. .1. .0. .1. .2. .3. .3. .1. .1. .0
..0. .0. .4. .3. .5. .1. .0. .2. .3. .0. .1. .4. .4. .0. .3. .3
..1. .4. .4. .2. .1. .4. .4. .1. .0. .1. .3. .0. .4. .3. .1. .1
..1. .5. .2. .0. .1. .4. .3. .3. .3. .3. .4. .5. .2. .4. .3. .1
..3. .1. .5. .2. .5. .3. .1. .0. .0. .1. .0. .3. .2. .5. .1. .2
..0. .0. .4. .1. .5. .1. .2. .2. .4. .4. .4. .2. .1. .3. .0. .2
CROSSREFS
Cf. A268956.
Sequence in context: A217325 A034332 A273027 * A146053 A163082 A189430
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 16 2016
STATUS
approved