A184074 Number of (n+1)X3 0..2 arrays with rows and columns in nondecreasing order and with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one

58, 74, 239, 578, 1599, 4233, 11128, 28248, 67622, 152873, 327044, 665356, 1293389, 2411872, 4330976, 7515107, 12640705, 20668977, 32935784, 51260994, 78079741, 116598158, 170976280, 246540941, 350031617, 489882295, 676542576, 922841348

Offset

1,1

Comments

Column 2 of A184081

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 4X3
..1..1..2....1..1..1....1..2..2....0..2..2....0..1..1....0..1..1....0..1..2
..1..2..0....1..2..2....2..1..2....2..1..1....1..0..1....1..0..1....1..1..0
..1..2..1....2..0..1....2..1..2....2..1..2....1..1..0....1..0..2....1..1..1
..2..1..1....2..1..2....2..2..1....2..1..2....1..1..1....1..1..1....1..2..0
...
...5..5.......5..6.......6..7.......5..6.......2..3.......2..3.......3..4...
...6..5.......5..5.......6..6.......6..5.......3..2.......2..3.......4..3...

Crossrefs

Sequence in context: A127024 A010338 A368615 * A281824 A127334 A275702

Adjacent sequences: A184071 A184072 A184073 * A184075 A184076 A184077

Keyword

nonn

Author

R. H. Hardin Jan 09 2011

Status

approved