A269612 Number of length-n 0..n arrays with no repeated value differing from the previous repeated value by other than plus two, zero or minus 1.

2, 9, 64, 612, 7440, 110099, 1923796, 38800210, 887591878, 22714070251, 643030722208, 19954247152834, 673552866591198, 24570545121277999, 963253518328620796, 40387590591059009524, 1803427358679591518028

Offset: 1

Author

R. H. Hardin, Mar 01 2016

Keywords

• nonn

Comments

Diagonal of A269619.

Examples

			Some solutions for n=6
..5. .1. .4. .0. .0. .5. .0. .1. .2. .0. .0. .1. .2. .6. .1. .6
..0. .3. .6. .0. .3. .1. .6. .0. .1. .2. .2. .2. .0. .2. .3. .4
..6. .5. .1. .4. .6. .1. .6. .6. .4. .5. .5. .2. .1. .0. .4. .2
..1. .2. .0. .1. .1. .1. .2. .0. .4. .1. .6. .4. .6. .1. .3. .3
..6. .2. .1. .5. .3. .6. .3. .4. .4. .0. .2. .0. .0. .0. .2. .4
..1. .5. .1. .6. .0. .1. .2. .2. .6. .6. .1. .5. .6. .4. .2. .4
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Crossrefs

Cf. A269619.