A230933 Number of black-square subarrays of (n+2)X(6+2) 0..3 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero

42, 438, 3768, 37984, 396950, 4092246, 41991510, 431437274, 4435310118, 45590703272, 468598417126, 4816515719528, 49507271980530, 508867096276696, 5230454214732138, 53761897206996568, 552598679075230458

Offset

1,1

Comments

Column 6 of A230935

Links

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

R. H. Hardin, Empirical recurrence of order 71

Formula

Empirical recurrence of order 71 (see link above)

Example

Some solutions for n=4
..x..0..x..0..x..1..x..3....x..0..x..2..x..2..x..0....x..0..x..2..x..0..x..0
..3..x..1..x..2..x..0..x....1..x..3..x..3..x..1..x....3..x..1..x..3..x..1..x
..x..2..x..0..x..3..x..1....x..2..x..0..x..0..x..0....x..2..x..0..x..2..x..0
..1..x..3..x..1..x..2..x....1..x..3..x..1..x..3..x....1..x..1..x..1..x..3..x
..x..0..x..2..x..0..x..1....x..2..x..2..x..0..x..2....x..0..x..0..x..0..x..2
..3..x..3..x..3..x..3..x....1..x..1..x..3..x..3..x....3..x..3..x..3..x..3..x

Crossrefs

Sequence in context: A251425 A242144 A242145 * A231110 A156762 A248094

Adjacent sequences: A230930 A230931 A230932 * A230934 A230935 A230936

Keyword

nonn

Author

R. H. Hardin, Nov 01 2013

Status

approved