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A205761 Number of (n+1)X2 0..3 arrays with every 2X2 subblock having nonzero determinant and having the same number of clockwise edge increases as its horizontal and vertical neighbors 1
192, 1262, 8659, 62607, 462040, 3490700, 26672819, 205747848, 1595214033, 12413756669, 96806542939, 756001274858, 5908892541394, 46209002829411, 361485247026700, 2828432016655919, 22133840165287141, 173221954994087709 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A205768

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) +34*a(n-2) -95*a(n-3) -439*a(n-4) -247*a(n-5) +510*a(n-6) -285*a(n-7) -1600*a(n-8) +110*a(n-9) +1431*a(n-10) -111*a(n-11) -883*a(n-12) -96*a(n-13) +262*a(n-14) +100*a(n-15) +8*a(n-16) for n>17

EXAMPLE

Some solutions for 5X5

..0..1....2..2....0..1....3..1....0..3....2..1....1..2....2..0....0..3....0..1

..3..1....0..2....3..3....3..3....1..1....1..3....1..3....1..1....2..3....1..2

..1..3....1..1....1..0....1..2....1..2....2..0....3..0....3..2....3..3....0..2

..2..1....2..3....2..1....1..1....1..1....3..1....1..2....2..1....0..2....2..1

..1..2....2..2....3..2....0..1....0..1....0..2....0..1....3..2....1..1....0..3

CROSSREFS

Sequence in context: A101451 A094949 A205768 * A133064 A183685 A254846

Adjacent sequences:  A205758 A205759 A205760 * A205762 A205763 A205764

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 30 2012

STATUS

approved

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Last modified April 6 21:24 EDT 2020. Contains 333286 sequences. (Running on oeis4.)