A210385 Number of (n+1)X4 0..2 arrays with every 2X2 subblock having one, two or three distinct clockwise edge differences

4881, 300653, 18515113, 1140445889, 70247824293, 4327063104645, 266534819947777, 16417791900623325, 1011289627240583529, 62292586103189236417, 3837047451749209162417, 236351291070066780092845

Offset

1,1

Comments

Column 3 of A210390

Links

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

Formula

Empirical: a(n) = 77*a(n-1) -947*a(n-2) -762*a(n-3) +40729*a(n-4) -22510*a(n-5) -553105*a(n-6) +407431*a(n-7) +2820807*a(n-8) -2312735*a(n-9) -5149392*a(n-10) +4029906*a(n-11) +3132370*a(n-12) -2109672*a(n-13) -422196*a(n-14) +359552*a(n-15) -43456*a(n-16)

Example

Some solutions for n=4
..0..1..2..0....2..1..0..2....0..0..2..0....0..0..2..1....0..1..0..2
..1..2..2..0....2..0..0..2....0..2..2..2....2..0..1..2....2..2..0..1
..0..1..1..0....1..0..1..2....1..1..0..2....0..2..2..1....2..0..2..1
..0..1..2..1....0..0..0..2....2..0..1..1....2..2..0..1....2..1..1..1
..2..2..1..0....2..2..0..2....1..0..0..2....2..1..0..1....1..2..2..2

Crossrefs

Sequence in context: A200972 A053396 A366468 * A075294 A206273 A086127

Adjacent sequences: A210382 A210383 A210384 * A210386 A210387 A210388

Keyword

nonn

Author

R. H. Hardin Mar 20 2012

Status

approved