A233096 Number of nX6 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 in row major order

122, 13886, 1742447, 221113913, 28141137872, 3584186808548, 456588234876461, 58167593275612991, 7410428544018968534, 944076282970629315482, 120273861208180846207643, 15322707992977335150302165

Offset

1,1

Comments

Column 6 of A233098

Links

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

Formula

Empirical: a(n) = 165*a(n-1) -4790*a(n-2) -5611*a(n-3) +735043*a(n-4) -3213934*a(n-5) -18478699*a(n-6) +150917466*a(n-7) -222314210*a(n-8) -539921014*a(n-9) +1645816177*a(n-10) -327049294*a(n-11) -2511974130*a(n-12) +1923920725*a(n-13) +866736274*a(n-14) -1189029263*a(n-15) +73362454*a(n-16) +189907550*a(n-17) -34427734*a(n-18) -5858198*a(n-19) +844832*a(n-20) +40464*a(n-21) -4272*a(n-22)

Example

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

Crossrefs

Sequence in context: A275399 A275264 A131970 * A121916 A097843 A223385

Adjacent sequences: A233093 A233094 A233095 * A233097 A233098 A233099

Keyword

nonn

Author

R. H. Hardin, Dec 04 2013

Status

approved