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A298842
Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 6 or 8 king-move adjacent elements, with upper left element zero.
0
0, 4, 48, 466, 5101, 74685, 1276034, 30242236, 1056423010, 50039513246, 3406811335705, 353276120560238, 52792202092264104
OFFSET
1,2
COMMENTS
Diagonal of A298846.
EXAMPLE
Some solutions for n=6
..0..1..0..1..0..1. .0..1..0..1..0..1. .0..0..0..1..0..1. .0..1..1..1..0..0
..1..0..1..1..1..0. .1..0..0..0..1..0. .0..1..1..1..1..0. .1..0..1..0..1..0
..1..1..1..1..1..1. .0..0..0..0..0..0. .0..1..1..1..1..1. .1..1..1..1..0..1
..1..0..1..1..1..0. .1..0..0..0..1..0. .1..1..1..1..1..0. .0..1..1..1..1..1
..0..1..0..1..0..1. .0..1..0..1..0..1. .0..1..1..1..1..0. .0..1..1..1..0..1
..0..0..1..1..1..0. .1..0..0..0..1..1. .1..0..1..0..0..0. .0..0..0..1..1..0
CROSSREFS
Cf. A298846.
Sequence in context: A357663 A297816 A297987 * A298649 A299603 A026942
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 27 2018
STATUS
approved