A209545 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences

7, 105, 5075, 723636, 294738262, 345350598642, 1159953545419801, 11179084602659460822, 309007688117388883362757, 24500703075201459753727015849, 5572033834554753242178727061445290

Offset

1,1

Comments

Diagonal of A209553

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

Example

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

Crossrefs

Sequence in context: A096131 A049210 A167814 * A002486 A360370 A203971

Adjacent sequences: A209542 A209543 A209544 * A209546 A209547 A209548

Keyword

nonn

Author

R. H. Hardin Mar 10 2012

Status

approved