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A255105 Number of length n+6 0..2 arrays with at most one downstep in every 6 consecutive neighbor pairs 1
540, 1008, 2032, 4338, 9297, 19263, 38010, 73278, 143045, 288057, 594045, 1228136, 2495244, 4970793, 9823140, 19533636, 39362880, 80112560, 163010352, 329127561, 659192991, 1316427636, 2637095196, 5313657069, 10747592751, 21727946097 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A255107

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) +a(n-3) +25*a(n-6) -42*a(n-7) +18*a(n-8) -10*a(n-12) +6*a(n-13)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

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

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

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

CROSSREFS

Cf. A255107

Sequence in context: A345390 A261290 A253463 * A298685 A185463 A069474

Adjacent sequences:  A255102 A255103 A255104 * A255106 A255107 A255108

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 14 2015

STATUS

approved

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Last modified January 28 18:56 EST 2022. Contains 350657 sequences. (Running on oeis4.)