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A248484 Number of length n+5 0..3 arrays with some three disjoint pairs in each consecutive six terms having the same sum. 1
724, 844, 988, 1156, 1348, 1564, 1804, 2284, 2860, 3532, 4300, 5164, 6124, 8044, 10348, 13036, 16108, 19564, 23404, 31084, 40300, 51052, 63340, 77164, 92524, 123244, 160108, 203116, 252268, 307564, 369004, 491884, 639340, 811372, 1007980 (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) = a(n-1) + 4*a(n-6) - 4*a(n-7).

Empirical g.f.: 4*x*(181 + 30*x + 36*x^2 + 42*x^3 + 48*x^4 + 54*x^5 - 664*x^6) / ((1 - x)*(1 - 2*x^3)*(1 + 2*x^3)). - Colin Barker, Nov 08 2018

EXAMPLE

Some solutions for n=6:

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

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

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

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

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

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

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

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

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

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

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

CROSSREFS

Column 3 of A248489.

Sequence in context: A035756 A107552 A232261 * A247894 A023680 A002769

Adjacent sequences:  A248481 A248482 A248483 * A248485 A248486 A248487

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 07 2014

STATUS

approved

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Last modified April 7 15:56 EDT 2020. Contains 333306 sequences. (Running on oeis4.)