A183977 1/4 the number of (n+1)X(n+1) binary arrays with all 2X2 subblock sums the same

4, 8, 14, 26, 46, 86, 158, 302, 574, 1118, 2174, 4286, 8446, 16766, 33278, 66302, 132094, 263678

Offset

1,1

Comments

Diagonal of A183986

Links

Table of n, a(n) for n=1..18.

Example

Some solutions for 5X5
..1..0..1..0..1....0..1..0..1..0....1..1..1..1..1....0..1..1..0..1
..1..0..1..0..1....1..0..1..0..1....0..1..0..1..0....1..0..0..1..0
..0..1..0..1..0....1..0..1..0..1....1..1..1..1..1....0..1..1..0..1
..1..0..1..0..1....1..0..1..0..1....1..0..1..0..1....1..0..0..1..0
..0..1..0..1..0....1..0..1..0..1....1..1..1..1..1....0..1..1..0..1

Crossrefs

Sequence in context: A008029 A129080 A138643 * A153364 A124743 A188575

Adjacent sequences: A183974 A183975 A183976 * A183978 A183979 A183980

Keyword

nonn

Author

R. H. Hardin Jan 08 2011

Status

approved