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A280906
Number of 5Xn 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
1
0, 1464, 610448, 75809243, 7083739466, 574982226478, 42393379206019, 2942502897692141, 195365303234441770, 12545498025247203218, 784842927161230385854, 48079317345677228680390, 2894948350054066836940824
OFFSET
1,2
COMMENTS
Row 5 of A280902.
LINKS
EXAMPLE
Some solutions for n=2
..0..0. .0..1. .0..0. .0..1. .0..0. .0..1. .0..0. .0..1. .0..0. .0..0
..0..0. .0..0. .1..1. .0..2. .0..0. .0..0. .1..1. .0..0. .0..1. .1..2
..1..1. .1..1. .0..0. .2..1. .1..2. .2..2. .1..1. .0..0. .1..1. .1..1
..0..1. .1..2. .2..2. .0..0. .0..2. .2..2. .2..1. .1..1. .0..0. .1..1
..0..2. .2..2. .2..2. .0..0. .1..1. .1..1. .2..2. .0..1. .2..0. .2..1
CROSSREFS
Cf. A280902.
Sequence in context: A164647 A284887 A237483 * A321010 A278368 A206862
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2017
STATUS
approved