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A204795 Number of (n+1)X4 0..1 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing 1
125, 1001, 6537, 42214, 270148, 1729515, 11096511, 71369791, 459554519, 2960897995, 19082285695, 122998524851, 792865245671, 5111098107899, 32948570941935, 212404040448451, 1369275577457015, 8827137858045451 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A204800

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) -17*a(n-2) -64*a(n-3) +168*a(n-4) +32*a(n-5) -256*a(n-6) +64*a(n-7) +64*a(n-8) for n>15

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A296037 A088896 A016851 * A243240 A237713 A000526

Adjacent sequences:  A204792 A204793 A204794 * A204796 A204797 A204798

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 19 2012

STATUS

approved

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Last modified October 15 22:25 EDT 2019. Contains 328038 sequences. (Running on oeis4.)