A199350 Number of nX1 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or one horizontal or vertical neighbors

1, 1, 1, 1, 10, 45, 105, 105, 1155, 5505, 13080, 12861, 154461, 769156, 1854541, 1809031, 22802779, 116526114, 283442460, 275058672, 3579775668, 18616654026, 45557997404, 44051920784, 586402520543, 3088257174951, 7590707929300

Offset

1,5

Comments

Column 1 of A199356

Links

R. H. Hardin, Table of n, a(n) for n = 1..117

Example

Some solutions for n=7
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....0....1....1....0....1....1....1....1....1....1....1....0....1....1
..2....0....1....2....2....1....2....0....2....1....2....1....0....1....2....2
..0....2....1....3....2....2....0....2....1....2....1....0....1....1....1....3
..3....2....2....3....0....2....3....3....0....3....3....2....2....2....2....2
..1....1....2....0....1....1....2....1....3....2....2....2....2....3....0....1
..2....3....3....2....3....3....1....2....2....0....0....3....3....3....3....3

Crossrefs

Sequence in context: A292611 A275623 A245871 * A199516 A001488 A009540

Adjacent sequences: A199347 A199348 A199349 * A199351 A199352 A199353

Keyword

nonn

Author

R. H. Hardin Nov 05 2011

Status

approved