A199194 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 two horizontal or vertical neighbors

1, 1, 1, 1, 6, 21, 41, 36, 281, 1051, 2056, 1721, 15131, 58951, 115631, 94376, 887643, 3551235, 6981925, 5609649, 55101276, 224543335, 442311619, 351574834, 3559509379, 14702228029, 29006278734, 22875971289, 236833911819

Offset

1,5

Comments

Column 1 of A199201

Links

R. H. Hardin, Table of n, a(n) for n = 1..148

Example

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

Crossrefs

Sequence in context: A056237 A364169 A364171 * A268223 A048036 A272671

Adjacent sequences: A199191 A199192 A199193 * A199195 A199196 A199197

Keyword

nonn

Author

R. H. Hardin Nov 03 2011

Status

approved