A183974 Half the number of (n+1)X4 0..3 arrays with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one

7688, 180236, 4470575, 124987628, 3536846184, 104681141079, 3111047359429, 94229825477592, 2858043537687204, 87400399190756306, 2673926034812946620, 82100619536962270903, 2521153331497012720738, 77542693730339312318157

Offset

1,1

Comments

Column 3 of A183976

Links

R. H. Hardin, Table of n, a(n) for n = 1..51

Example

Some solutions for 3X4
..1..1..1..3....1..3..0..1....1..2..0..2....1..1..3..2....1..1..0..3
..2..2..1..1....1..0..1..1....0..1..0..2....3..1..1..0....0..3..1..0
..2..0..2..2....1..2..0..2....3..0..2..0....1..1..2..2....3..0..2..2
...
...6..5..6.......5..4..3.......4..3..4.......6..6..6.......5..5..4...
...6..5..6.......4..3..4.......4..3..4.......6..5..5.......6..6..5...

Crossrefs

Sequence in context: A184026 A035907 A307134 * A234223 A253923 A259832

Adjacent sequences: A183971 A183972 A183973 * A183975 A183976 A183977

Keyword

nonn

Author

R. H. Hardin Jan 08 2011

Status

approved