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A267668 Number of 3Xn 0..1 arrays with every repeated value in every row unequal to the previous repeated value, and in every column equal to the previous repeated value, and new values introduced in row-major sequential order. 1
4, 32, 108, 500, 1372, 5324, 13500, 48668, 119164, 415292, 1000188, 3429500, 8193532, 27871484, 66325500, 224727548, 533731324, 1804870652, 4282396668, 14467221500, 34309431292, 115850907644, 274676629500, 927260024828 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A267667.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +14*a(n-2) -14*a(n-3) -56*a(n-4) +56*a(n-5) +64*a(n-6) -64*a(n-7)

EXAMPLE

Some solutions for n=8

..0..1..0..1..0..1..0..1....0..1..0..1..0..0..1..1....0..1..0..1..0..1..0..1

..1..0..1..0..1..0..1..1....0..0..1..0..1..1..0..1....0..0..1..0..1..0..1..1

..1..1..0..1..0..0..1..0....1..0..1..0..1..1..0..1....1..0..1..1..0..0..1..0

CROSSREFS

Cf. A267667.

Sequence in context: A211626 A211627 A033430 * A338322 A239056 A088658

Adjacent sequences:  A267665 A267666 A267667 * A267669 A267670 A267671

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 19 2016

STATUS

approved

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Last modified July 24 01:41 EDT 2021. Contains 346269 sequences. (Running on oeis4.)