A232919 Number of nX7 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, diagonally or antidiagonally

192, 2952, 54600, 1054446, 20706696, 409408542, 8119777890, 161274860934, 3205524631536, 63736076920680, 1267501914060906, 25208720719305108, 501386554599817674, 9972511770847267278, 198354251861625923238

Offset

1,1

Comments

Column 7 of A232920

Links

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

Formula

Empirical: a(n) = 41*a(n-1) -549*a(n-2) +2618*a(n-3) +700*a(n-4) -36805*a(n-5) +58333*a(n-6) +125681*a(n-7) -324274*a(n-8) -57887*a(n-9) +571708*a(n-10) -269670*a(n-11) -297677*a(n-12) +291231*a(n-13) -41230*a(n-14) -33231*a(n-15) +11178*a(n-16) -6*a(n-17) -348*a(n-18) +32*a(n-19)

Example

Some solutions for n=3
..2..1..2..1..2..2..2....2..1..0..0..0..0..1....1..0..0..0..0..1..0
..2..1..2..1..2..2..2....2..1..0..1..0..0..1....0..0..0..1..0..1..0
..0..1..2..1..2..2..1....0..1..0..1..0..0..0....0..1..0..0..0..0..0

Crossrefs

Sequence in context: A183702 A351632 A174384 * A362738 A209594 A168635

Adjacent sequences: A232916 A232917 A232918 * A232920 A232921 A232922

Keyword

nonn

Author

R. H. Hardin, Dec 02 2013

Status

approved