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A232917 Number of n X 5 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, diagonally or antidiagonally. 1
48, 396, 3612, 33702, 316800, 2986152, 28178262, 266016264, 2511769872, 23718269934, 223974692940, 2115047273040, 19973000452170, 188611165560264, 1781114471948484, 16819628783052894, 158833109275938936 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 14*a(n-1) - 45*a(n-2) + 15*a(n-3) + 36*a(n-4) - 19*a(n-5) + 2*a(n-6).
Empirical g.f.: 6*x*(4 - 7*x + x^2)*(2 - 8*x - 5*x^2 + 3*x^3) / (1 - 14*x + 45*x^2 - 15*x^3 - 36*x^4 + 19*x^5 - 2*x^6). - Colin Barker, Oct 06 2018
EXAMPLE
Some solutions for n=4:
..0..1..0..1..2....0..0..1..0..0....0..1..0..1..2....2..2..1..0..1
..0..0..0..1..2....0..0..0..0..0....2..1..2..1..0....2..2..1..2..1
..0..1..0..1..2....1..0..1..0..0....2..1..2..1..2....1..2..1..2..1
..2..1..2..1..2....1..0..1..0..1....0..1..0..1..0....2..2..2..2..1
CROSSREFS
Column 5 of A232920.
Sequence in context: A160335 A019558 A339761 * A172201 A249293 A347168
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 02 2013
STATUS
approved

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Last modified June 12 14:48 EDT 2024. Contains 373331 sequences. (Running on oeis4.)