A234030 Number of (n+1)X(2+1) 0..4 arrays with every 2X2 subblock having the absolute values of all six edge and diagonal differences no larger than 1

307, 3059, 30263, 300597, 2990333, 29784763, 296931707, 2962134453, 29563955929, 295171226895, 2947800648335, 29444533201105, 294151869831861, 2938885998922955, 29364742567410699, 293422429935714509

Offset

1,1

Comments

Column 2 of A234036

Links

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

Formula

Empirical: a(n) = 18*a(n-1) -79*a(n-2) -56*a(n-3) +459*a(n-4) +56*a(n-5) -597*a(n-6) -88*a(n-7) +90*a(n-8) -10*a(n-9)

Example

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

Crossrefs

Sequence in context: A176091 A359640 A118284 * A359641 A309566 A118843

Adjacent sequences: A234027 A234028 A234029 * A234031 A234032 A234033

Keyword

nonn

Author

R. H. Hardin, Dec 18 2013

Status

approved