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A267789

Number of 3Xn 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.

6, 36, 216, 1056, 5004, 22110, 94554, 391314, 1582824, 6278400, 24520080, 94523100, 360449622, 1361930880, 5105718624, 19011717024, 70378031196, 259193957658, 950281765146, 3470120581542, 12626754295920, 45799000309176

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OFFSET

1,1

COMMENTS

Row 3 of A267788.

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -12*a(n-2) -40*a(n-3) +80*a(n-4) +100*a(n-5) -134*a(n-6) -160*a(n-7) +8*a(n-8) +48*a(n-9) +8*a(n-10) -4*a(n-11) -a(n-12)

EXAMPLE

Some solutions for n=4

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