A232924 Number of 5Xn 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, diagonally or antidiagonally

243, 486, 5118, 37008, 316800, 2515716, 20706696, 167584476, 1367432712, 11114122476, 90504770460, 736322452020, 5993199861276, 48770296532280, 396915186768744, 3230114185683960, 26287470177830052, 213931378583656296

Offset

1,1

Comments

Row 5 of A232920

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 6*a(n-1) +31*a(n-2) -97*a(n-3) -163*a(n-4) +417*a(n-5) +93*a(n-6) -514*a(n-7) +192*a(n-8) +72*a(n-9) -36*a(n-10) for n>11

Example

Some solutions for n=4
..1..2..1..2....1..2..1..2....2..1..2..2....0..1..2..2....0..1..0..0
..2..2..1..0....1..0..1..2....0..1..2..1....2..1..2..2....0..1..0..1
..1..2..1..0....1..0..1..0....2..1..0..1....0..1..2..1....0..0..0..0
..1..0..1..0....0..0..1..2....2..1..2..1....0..1..2..1....0..0..0..1
..1..0..1..0....0..0..1..0....2..2..2..1....2..1..2..1....0..1..0..0

Crossrefs

Sequence in context: A046375 A226064 A157958 * A067838 A340757 A255111

Adjacent sequences: A232921 A232922 A232923 * A232925 A232926 A232927

Keyword

nonn

Author

R. H. Hardin, Dec 02 2013

Status

approved