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A247399 Number of length n+4 0..3 arrays with no disjoint pairs in any consecutive five terms having the same sum. 1
200, 264, 340, 428, 528, 640, 864, 1136, 1456, 1824, 2240, 3072, 4096, 5312, 6720, 8320, 11520, 15488, 20224, 25728, 32000, 44544, 60160, 78848, 100608, 125440, 175104, 237056, 311296, 397824, 496640, 694272, 941056, 1236992, 1582080 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-5) - 8*a(n-10).

Empirical g.f.: 4*x*(50 + 66*x + 85*x^2 + 107*x^3 + 132*x^4 - 140*x^5 - 180*x^6 - 226*x^7 - 278*x^8 - 336*x^9) / ((1 - 2*x^5)*(1 - 4*x^5)). - Colin Barker, Nov 07 2018

EXAMPLE

Some solutions for n=6:

..3....2....1....0....0....0....3....3....1....3....1....3....2....1....2....1

..2....3....0....0....0....2....3....2....1....0....1....3....1....2....1....3

..2....3....3....0....2....0....2....1....1....1....3....3....3....0....0....3

..0....0....3....2....0....1....0....1....2....0....1....1....1....2....2....2

..2....3....3....3....3....0....3....1....3....0....0....2....1....2....2....3

..1....1....2....0....0....0....3....3....1....3....1....3....0....1....2....1

..2....3....0....0....0....2....3....2....1....0....1....3....1....2....1....3

..2....3....3....0....2....0....2....1....1....1....3....3....3....0....0....3

..0....0....3....2....0....3....0....1....0....0....1....1....1....2....2....2

..2....3....3....1....3....0....3....1....3....0....0....2....1....2....2....3

CROSSREFS

Column 3 of A247404.

Sequence in context: A192545 A118118 A124472 * A078492 A166256 A252059

Adjacent sequences:  A247396 A247397 A247398 * A247400 A247401 A247402

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 16 2014

STATUS

approved

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Last modified October 18 01:04 EDT 2019. Contains 328135 sequences. (Running on oeis4.)