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A280900
Number of nX6 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
9, 21762, 9426050, 2571528867, 574982226478, 114677717497532, 21239418911643829, 3734730743379447607, 631954681035516327314, 103814102347627733308778, 16657805707161598572521126
OFFSET
1,1
COMMENTS
Column 6 of A280902.
LINKS
EXAMPLE
Some solutions for n=2
..0..1..1..0..2..0. .0..1..1..1..0..1. .0..1..0..1..1..2. .0..1..2..1..1..0
..1..2..2..1..0..0. .1..2..0..1..0..2. .2..0..0..1..0..1. .1..1..2..1..2..1
CROSSREFS
Cf. A280902.
Sequence in context: A258719 A292562 A140596 * A333554 A055309 A288940
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2017
STATUS
approved