A230171 Number of nX3 0..2 arrays x(i,j) with each element horizontally, vertically, diagonally or antidiagonally next to at least one element with value 2-x(i,j)

3, 193, 3787, 78849, 1637019, 33908253, 704822331, 14643857893, 304104787011, 6315931613849, 131183171878903, 2724650132436217, 56590036701710599, 1175359025263665849, 24411897444501278899, 507028430780683682221

Offset

1,1

Comments

Column 3 of A230176

Links

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

Formula

Empirical: a(n) = 14*a(n-1) +50*a(n-2) +1467*a(n-3) +7177*a(n-4) +27682*a(n-5) +45031*a(n-6) +22024*a(n-7) -61992*a(n-8) -130960*a(n-9) -145201*a(n-10) -231795*a(n-11) -285312*a(n-12) -178036*a(n-13) +6345*a(n-14) -60491*a(n-15) -91748*a(n-16) -155577*a(n-17) +52430*a(n-18) +56132*a(n-19) -1509*a(n-20) -9112*a(n-21) +502*a(n-22) +1976*a(n-23) +240*a(n-24) -96*a(n-25) -32*a(n-26) for n>27

Example

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

Crossrefs

Sequence in context: A159658 A257038 A202109 * A332957 A203749 A093978

Adjacent sequences: A230168 A230169 A230170 * A230172 A230173 A230174

Keyword

nonn

Author

R. H. Hardin, Oct 11 2013

Status

approved