login
A304340
Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.
0
1, 4, 27, 290, 6373, 135445, 4921043, 343449680, 30008468246, 4458350461574
OFFSET
1,2
COMMENTS
Diagonal of A304347.
EXAMPLE
Some solutions for n=5
..0..0..1..1..1. .0..0..1..1..0. .0..0..0..1..0. .0..0..1..1..0
..1..1..1..1..0. .1..1..1..1..0. .0..0..0..0..0. .1..0..0..0..0
..1..1..1..1..1. .1..1..1..1..1. .0..0..0..0..1. .0..0..0..0..0
..0..0..1..1..0. .1..1..1..1..1. .0..0..0..0..1. .1..0..0..0..0
..0..0..1..1..0. .1..1..0..1..1. .1..1..0..0..0. .0..1..0..0..0
CROSSREFS
Cf. A304347.
Sequence in context: A179494 A295255 A203157 * A336227 A119820 A159599
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 11 2018
STATUS
approved