login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A280404
Number of 6Xn 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
1
0, 1666, 31242, 410670, 5338004, 68842232, 874372050, 10989663174, 136908921742, 1690267696260, 20713635101862, 252098542020936, 3050075961754870, 36706018506588918, 439673171758668484, 5244607430822259138
OFFSET
1,2
COMMENTS
Row 6 of A280398.
LINKS
EXAMPLE
Some solutions for n=3
..0..0..1. .0..0..0. .0..0..1. .0..0..1. .0..0..0. .0..0..1. .0..0..1
..0..1..1. .0..0..0. .1..1..1. .0..2..2. .0..0..0. .0..1..1. .0..0..0
..2..2..0. .1..1..1. .1..1..2. .2..1..1. .1..1..1. .0..0..0. .2..2..2
..2..0..0. .1..2..0. .2..2..2. .1..0..0. .0..0..1. .0..2..0. .2..0..0
..2..0..2. .2..0..0. .1..1..1. .0..0..2. .0..0..2. .2..0..1. .0..0..2
..0..2..2. .1..1..1. .2..2..2. .0..2..2. .0..2..2. .0..1..1. .0..2..2
CROSSREFS
Cf. A280398.
Sequence in context: A234976 A303643 A068744 * A054811 A164773 A321001
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 02 2017
STATUS
approved