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A204623 Number of (n+1)X2 0..2 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..2 introduced in row major order 3
12, 96, 768, 6144, 49152, 393216, 3145728, 25165824, 201326592, 1610612736, 12884901888, 103079215104, 824633720832, 6597069766656, 52776558133248, 422212465065984, 3377699720527872, 27021597764222976, 216172782113783808 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A204630

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1)

EXAMPLE

Some solutions for n=3

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

..0..1....1..2....0..1....0..1....2..1....1..1....0..1....0..1....0..1....1..1

..2..2....0..2....0..1....1..2....2..0....2..0....1..1....0..0....2..1....1..2

..0..2....2..1....0..1....2..2....0..1....0..1....1..2....2..1....0..2....1..2

CROSSREFS

Cf. A094085, A270568.

Sequence in context: A264418 A073392 A038845 * A270568 A223151 A155620

Adjacent sequences:  A204620 A204621 A204622 * A204624 A204625 A204626

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 17 2012

STATUS

approved

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Last modified October 21 11:25 EDT 2019. Contains 328295 sequences. (Running on oeis4.)