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A232511 Number of (n+1)X(4+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally, diagonally or antidiagonally, with no adjacent elements equal 1
54, 326, 2516, 19138, 145682, 1110752, 8470018, 64594290, 492627324, 3757052022, 28653492802, 218528696816, 1666631440922, 12710736921242, 96939753662116, 739321100203858, 5638509196177426, 43002676390969828, 327964380966543498 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A232515
LINKS
FORMULA
Empirical: a(n) = 8*a(n-1) +a(n-2) -23*a(n-3) -48*a(n-4) -9*a(n-5) +40*a(n-6) +44*a(n-7) +5*a(n-8) -20*a(n-9) +3*a(n-10) +9*a(n-11) +6*a(n-12) -a(n-13) -2*a(n-14)
EXAMPLE
Some solutions for n=5
..2..1..0..1..0....2..1..0..1..2....0..1..2..1..0....0..1..0..1..0
..0..1..2..1..0....0..1..0..1..0....2..1..2..1..2....0..1..2..1..0
..2..1..2..1..0....0..1..0..1..2....0..1..2..1..0....0..1..2..1..2
..2..1..0..1..0....0..1..2..1..0....0..1..2..1..0....2..1..2..1..2
..2..1..0..1..0....2..1..0..1..2....2..1..2..1..0....0..1..0..1..0
..0..1..0..1..2....0..1..0..1..2....0..1..0..1..0....0..1..2..1..0
CROSSREFS
Sequence in context: A245830 A102838 A090832 * A262853 A230921 A239687
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 25 2013
STATUS
approved

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Last modified July 16 12:01 EDT 2024. Contains 374348 sequences. (Running on oeis4.)