A233241 Number of 3Xn 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order

11, 313, 18744, 1212549, 79794804, 5267525102, 347931872810, 22984197561232, 1518355064369787, 100304170431867107, 6626206197404526693, 437734684222631005909, 28917249596515421269798, 1910306307000347264023968

Offset

1,1

Comments

Row 3 of A233239

Links

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

Formula

Empirical: a(n) = 79*a(n-1) -844*a(n-2) -956*a(n-3) +16385*a(n-4) -10631*a(n-5) -45620*a(n-6) +63092*a(n-7) -24384*a(n-8) +2880*a(n-9) for n>10

Example

Some solutions for n=3
..0..1..2....0..1..0....0..1..2....0..1..5....0..1..1....0..1..2....0..1..0
..5..4..2....0..0..0....3..1..0....2..1..0....0..2..2....1..2..2....1..0..2
..2..2..5....4..0..2....1..1..1....2..0..2....0..2..2....0..2..2....1..5..4

Crossrefs

Sequence in context: A090272 A090271 A267753 * A266830 A266029 A106827

Adjacent sequences: A233238 A233239 A233240 * A233242 A233243 A233244

Keyword

nonn

Author

R. H. Hardin, Dec 06 2013

Status

approved