A238021 Number of (n+2)X(1+2) 0..1 arrays with the (lower) medians of each row unequal to its neighbors and each column equal to its neighbors

20, 146, 260, 1820, 3752, 24818, 56612, 355364, 872600, 5238356, 13605608, 78675128, 213600848, 1196862482, 3368311460, 18375903380, 53276769080, 284073991196, 844510526840, 4414662677384, 13408173196592, 68889810592532

Offset

1,1

Comments

Column 1 of A238026

Links

R. H. Hardin, Table of n, a(n) for n = 1..89

Example

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

Crossrefs

Sequence in context: A071816 A263960 A190067 * A183959 A094171 A100190

Adjacent sequences: A238018 A238019 A238020 * A238022 A238023 A238024

Keyword

nonn

Author

R. H. Hardin, Feb 17 2014

Status

approved