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A223115 Number of 2Xn 0..2 arrays with exactly floor(2Xn/2) elements equal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order 1
0, 4, 28, 124, 832, 6092, 40960, 284702, 1978008, 13815432, 97060752, 684943720, 4843134784, 34353796672, 244220744192, 1739831572888, 12416759857824, 88760284445216, 635404450146240, 4554610943662592, 32686092803274368 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 2 of A223114
LINKS
EXAMPLE
Some solutions for n=3
..0..0..0....0..1..2....0..1..2....0..1..1....0..1..1....0..1..0....0..1..2
..1..2..1....1..1..2....0..1..1....1..2..0....0..1..0....2..1..1....2..0..0
CROSSREFS
Sequence in context: A249629 A131459 A231581 * A296381 A240434 A270275
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 14 2013
STATUS
approved

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Last modified March 29 04:59 EDT 2024. Contains 371264 sequences. (Running on oeis4.)