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A246001 Number of length 6+2 0..n arrays with no pair in any consecutive three terms totalling exactly n 1
2, 56, 2308, 23168, 171942, 795144, 3057032, 9401216, 25819210, 62402840, 139927692, 288998016, 566057198, 1047126248, 1862251792, 3175741184, 5253738642, 8416795896, 13163097620, 20070807680, 30009814582, 43960191176 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 6 of A245995

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +3*a(n-2) -17*a(n-3) +3*a(n-4) +39*a(n-5) -25*a(n-6) -45*a(n-7) +45*a(n-8) +25*a(n-9) -39*a(n-10) -3*a(n-11) +17*a(n-12) -3*a(n-13) -3*a(n-14) +a(n-15)

EXAMPLE

Some solutions for n=5

..0....4....3....3....0....1....0....0....4....1....4....3....0....0....4....1

..3....4....3....0....4....0....4....1....3....1....4....3....3....3....0....1

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

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

..4....1....1....0....4....4....3....3....4....3....0....3....2....3....1....0

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

..5....1....0....1....0....2....3....1....3....3....2....5....1....1....0....3

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

CROSSREFS

Sequence in context: A224297 A193476 A193475 * A009555 A054959 A206305

Adjacent sequences:  A245998 A245999 A246000 * A246002 A246003 A246004

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 09 2014

STATUS

approved

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Last modified January 21 16:22 EST 2020. Contains 331114 sequences. (Running on oeis4.)