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A232402
Number of (n+1) X (4+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally or vertically, with no adjacent elements equal.
1
16, 72, 176, 1120, 2788, 16884, 44528, 255432, 706796, 3869856, 11187884, 58747800, 176480560, 893567100, 2775528020, 13614481384, 43541140184, 207746258444, 681590483408, 3174357370252, 10650085993156, 48563169764668
OFFSET
1,1
COMMENTS
Column 4 of A232406.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +17*a(n-2) -7*a(n-3) -48*a(n-4) -71*a(n-5) +101*a(n-6) +114*a(n-7) +121*a(n-8) -18*a(n-9) -143*a(n-10) -281*a(n-11) -409*a(n-12) -135*a(n-13) +659*a(n-14) +421*a(n-15) +172*a(n-16) -528*a(n-17) -162*a(n-18) -87*a(n-19) +454*a(n-20) +647*a(n-21) +293*a(n-22) +374*a(n-23) +143*a(n-24) +108*a(n-25) -19*a(n-26) -14*a(n-27) -6*a(n-28) +2*a(n-29).
EXAMPLE
Some solutions for n=4
..1..0..2..1..0....0..1..0..1..2....2..1..0..1..2....0..1..2..1..0
..2..1..0..2..1....1..2..1..0..1....1..0..1..2..1....1..2..1..2..1
..1..0..2..1..0....0..1..2..1..0....0..1..0..1..0....2..1..0..1..2
..0..1..0..2..1....1..0..1..2..1....1..2..1..2..1....1..2..1..0..1
..1..2..1..0..2....2..1..0..1..0....0..1..2..1..0....0..1..0..1..2
CROSSREFS
Cf. A232406.
Sequence in context: A212862 A253151 A339993 * A212513 A279905 A146748
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 23 2013
STATUS
approved