A234156 Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock having the absolute values of all six edge and diagonal differences no larger than 1

1108, 21428, 411712, 7952532, 153793284, 2976757624, 57647946980, 1116833738020, 21642612331360, 419482808622564, 8131644594825316, 157646909459448984, 3056492082359701508, 59262933197614888180

Offset

1,1

Comments

Column 3 of A234161

Links

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

Formula

Empirical: a(n) = 38*a(n-1) -412*a(n-2) +740*a(n-3) +5548*a(n-4) -11466*a(n-5) -28213*a(n-6) +27544*a(n-7) +43860*a(n-8) -11608*a(n-9) -8172*a(n-10) +1584*a(n-11)

Example

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

Crossrefs

Sequence in context: A172947 A172678 A172774 * A066163 A336172 A252010

Adjacent sequences: A234153 A234154 A234155 * A234157 A234158 A234159

Keyword

nonn

Author

R. H. Hardin, Dec 20 2013

Status

approved