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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 2
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 (list; graph; refs; listen; history; text; internal format)
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: A007339 A225150 A056237 * A268223 A048036 A272671

Adjacent sequences: A199191 A199192 A199193 * A199195 A199196 A199197

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 03 2011

STATUS

approved

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Last modified January 28 22:08 EST 2023. Contains 359905 sequences. (Running on oeis4.)