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A267784 Number of nX4 0..1 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value. 1
15, 225, 1056, 5081, 14956, 44742, 102954, 238813, 472174, 935890, 1669256, 2973801, 4921484, 8116406, 12686802, 19733869, 29485150, 43804354, 63094592, 90326137, 126206748, 175240166, 238647082, 322974141, 430276638, 569730226 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A267788.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +6*a(n-2) -14*a(n-3) -14*a(n-4) +42*a(n-5) +14*a(n-6) -70*a(n-7) +70*a(n-9) -14*a(n-10) -42*a(n-11) +14*a(n-12) +14*a(n-13) -6*a(n-14) -2*a(n-15) +a(n-16) for n>18

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A267788.

Sequence in context: A207726 A207596 A208115 * A207700 A207905 A208036

Adjacent sequences:  A267781 A267782 A267783 * A267785 A267786 A267787

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 20 2016

STATUS

approved

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Last modified September 16 08:17 EDT 2021. Contains 347469 sequences. (Running on oeis4.)