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A302169
Number of 7Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
64, 86, 111, 361, 621, 1563, 2853, 7306, 12963, 33522, 61775, 157788, 293072, 746806, 1414502, 3560709, 6821117, 17041351, 33109869, 81878009, 160823108, 394307941, 783258522, 1903510955, 3817195020, 9202579162, 18623741941, 44557228577
OFFSET
1,1
COMMENTS
Row 7 of A302163.
FORMULA
Empirical recurrence of order 80 (see link above)
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..1..1..0..1. .0..1..0..0..1. .0..1..1..0..1
..0..1..0..1..0. .1..0..1..0..1. .1..1..0..1..0. .1..0..1..0..1
..0..1..0..1..0. .1..0..1..0..1. .0..1..0..1..0. .1..0..1..0..1
..0..1..0..1..1. .1..0..1..0..1. .0..1..0..1..1. .1..0..1..0..1
..0..1..0..1..0. .1..0..1..0..1. .0..1..0..1..0. .1..0..1..0..1
..1..0..0..1..0. .1..0..1..0..0. .0..1..0..1..0. .1..0..1..0..1
..1..0..1..0..0. .1..0..1..0..1. .0..1..1..0..0. .1..0..0..1..1
CROSSREFS
Cf. A302163.
Sequence in context: A141817 A008435 A223083 * A302640 A302432 A303202
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 02 2018
STATUS
approved