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A298088
Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.
0
0, 3, 15, 30, 45, 171, 229, 417, 822, 1359, 1993, 5049, 3669, 7878, 33158, 16734, 37752, 734240, 160344, 389218, 50665319, 1735920, 6661033
OFFSET
1,2
COMMENTS
Diagonal of A298093.
EXAMPLE
Some solutions for n=7
..0..0..1..0..1..0..1. .0..0..1..0..0..1..1. .0..1..1..0..0..0..0
..1..1..0..1..0..1..0. .1..0..1..1..1..0..0. .1..0..0..1..1..1..1
..1..0..1..0..1..0..1. .1..1..1..0..0..0..1. .0..1..0..0..0..0..0
..1..1..1..0..0..0..1. .0..0..0..1..1..0..1. .0..1..0..1..1..1..1
..1..1..1..0..0..0..1. .1..1..1..1..0..0..1. .0..1..0..0..0..0..0
..1..0..1..0..1..0..1. .0..0..0..1..0..0..1. .1..0..0..1..1..1..1
..0..0..1..1..1..0..0. .1..1..1..0..1..1..0. .0..1..1..0..0..0..0
CROSSREFS
Cf. A298093.
Sequence in context: A020493 A087183 A297851 * A290325 A271326 A106354
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 12 2018
STATUS
approved