A203632 Number of nX2 0..1 arrays with the counts of all possible adjacent horizontal and vertical pair sum values being within one of each other

4, 4, 6, 6, 26, 90, 222, 674, 2158, 6546, 20382, 63922, 200946, 639554, 2037050, 6507122, 20923918, 67445362, 217924638, 706488874, 2295658074, 7475460546, 24394962306, 79753388458, 261182132074, 856719190626, 2814241452698

Offset

1,1

Comments

Column 2 of A203638

Links

R. H. Hardin, Table of n, a(n) for n = 1..169

Example

Some solutions for n=5
..1..1....1..0....0..1....1..1....1..0....1..1....0..0....1..1....0..0....1..1
..1..0....0..0....0..0....1..1....1..1....0..1....0..0....1..1....1..0....1..1
..1..1....0..0....0..0....0..0....1..1....0..1....1..1....0..0....1..0....0..0
..0..0....1..1....1..1....0..0....0..0....0..1....0..1....0..0....1..0....0..1
..0..0....1..1....1..1....1..0....0..0....0..0....1..1....0..1....1..1....0..0

Crossrefs

Sequence in context: A171384 A226833 A262260 * A278766 A320828 A065677

Adjacent sequences: A203629 A203630 A203631 * A203633 A203634 A203635

Keyword

nonn

Author

R. H. Hardin Jan 04 2012

Status

approved