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A267715 Number of nX4 0..1 arrays with every repeated value in every row and column greater than the previous repeated value. 1
9, 81, 270, 872, 1915, 4266, 7879, 14632, 24440, 40816, 63714, 99260, 147469, 218666, 312723, 446708, 619670, 859376, 1162558, 1573616, 2084223, 2764010, 3595063, 4684320, 5997316, 7694800, 9715586, 12296260, 15334641, 19171946, 23645587 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A267719.

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=5

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

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

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

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

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

CROSSREFS

Cf. A267719.

Sequence in context: A207909 A208421 A209646 * A207753 A207107 A207463

Adjacent sequences:  A267712 A267713 A267714 * A267716 A267717 A267718

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 19 2016

STATUS

approved

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Last modified November 27 16:35 EST 2021. Contains 349394 sequences. (Running on oeis4.)