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A269495 Number of length-4 0..n arrays with no repeated value differing from the previous repeated value by one. 1
14, 77, 250, 617, 1286, 2389, 4082, 6545, 9982, 14621, 20714, 28537, 38390, 50597, 65506, 83489, 104942, 130285, 159962, 194441, 234214, 279797, 331730, 390577, 456926, 531389, 614602, 707225, 809942, 923461, 1048514, 1185857, 1336270 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A269494.

LINKS

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

FORMULA

Empirical: a(n) = n^4 + 4*n^3 + 6*n^2 + 2*n + 1

EXAMPLE

Some solutions for n=6

..2. .5. .3. .5. .6. .1. .1. .5. .5. .6. .4. .0. .5. .5. .2. .6

..1. .3. .1. .5. .2. .3. .1. .2. .5. .6. .4. .6. .1. .6. .3. .0

..3. .2. .6. .3. .1. .2. .5. .5. .1. .6. .2. .3. .3. .2. .6. .2

..1. .0. .6. .6. .0. .4. .2. .1. .2. .6. .6. .5. .0. .6. .3. .2

CROSSREFS

Cf. A269494.

Sequence in context: A280396 A010821 A022706 * A085462 A050404 A044201

Adjacent sequences:  A269492 A269493 A269494 * A269496 A269497 A269498

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 28 2016

STATUS

approved

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Last modified February 24 06:13 EST 2018. Contains 299597 sequences. (Running on oeis4.)