login
A301958
Number of n X n 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
1
1, 5, 16, 64, 311, 2544, 33860, 655332, 20467528, 1126897464, 99461928147, 13746050749383, 3153776142960984, 1195380968976593488, 725993180042754573732, 714087263476969685695404
OFFSET
1,2
COMMENTS
Diagonal of A301964.
LINKS
EXAMPLE
Some solutions for n=5
..0..1..0..0..1. .0..0..1..0..1. .0..1..1..0..1. .0..1..1..0..1
..0..1..1..0..1. .1..0..1..0..1. .0..0..1..0..1. .0..0..1..1..1
..0..0..1..0..1. .1..1..1..0..0. .1..1..1..0..1. .1..0..1..0..1
..1..0..1..1..1. .1..0..1..1..0. .1..0..1..0..0. .1..0..0..0..1
..1..0..1..0..1. .1..0..0..1..1. .1..0..1..1..0. .1..0..1..0..0
CROSSREFS
Cf. A301964.
Sequence in context: A034532 A092497 A275100 * A349568 A026525 A007043
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 29 2018
STATUS
approved