A206101 Number of (n+1) X (n+1) 0..3 arrays with the number of clockwise edge increases in 2 X 2 subblocks nondecreasing, and counterclockwise edge increases nonincreasing, rightwards and downwards.

256, 33688, 8114696, 12793359564, 115868265653308, 5228849998045900208, 1142673565861296088168308

Offset

1,1

Comments

Diagonal of A206109.

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A205634 A269292 A205362 * A221091 A205458 A206744

Adjacent sequences: A206098 A206099 A206100 * A206102 A206103 A206104

Keyword

nonn

Author

R. H. Hardin, Feb 03 2012

Status

approved