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A196072 Number of nX2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,3,2,1,4 for x=0,1,2,3,4 1
0, 1, 2, 0, 6, 2, 8, 12, 10, 32, 26, 58, 82, 104, 204, 238, 424, 606, 870, 1438, 1952, 3156, 4602, 6848, 10634, 15354, 23794, 35192, 52844, 80254, 118744, 180686, 269382, 405118, 610576, 911988, 1377066, 2061328, 3099290, 4659546, 6984594, 10512968 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Every 0 is next to 0 0's, every 1 is next to 1 3's, every 2 is next to 2 2's, every 3 is next to 3 1's, every 4 is next to 4 4's

Column 2 of A196078

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = a(n-2) +a(n-3) +2*a(n-5)

EXAMPLE

All solutions for n=5

..2..2....2..2....1..0....1..0....0..1....0..1

..2..2....2..2....3..1....3..1....1..3....1..3

..0..1....1..0....1..1....1..0....0..1....1..1

..1..3....3..1....1..3....2..2....2..2....3..1

..0..1....1..0....0..1....2..2....2..2....1..0

CROSSREFS

Sequence in context: A078991 A217572 A021833 * A049257 A054877 A095834

Adjacent sequences:  A196069 A196070 A196071 * A196073 A196074 A196075

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 27 2011

STATUS

approved

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Last modified April 19 03:33 EDT 2014. Contains 240738 sequences.