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A221781
Number of 2Xn arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out left turns
1
1, 25, 258, 2631, 26861, 273816, 2792384, 28476902, 290412831, 2961693438, 30204010646, 308027296692, 3141331776218, 32036009453063, 326710444860258, 3331866751461036, 33979128068695941, 346526806242931531
OFFSET
1,2
COMMENTS
Row 2 of A221780
LINKS
FORMULA
Empirical: a(n) = 19*a(n-1) -119*a(n-2) +340*a(n-3) -447*a(n-4) +231*a(n-5) -367*a(n-6) +1636*a(n-7) -2994*a(n-8) +3520*a(n-9) -4119*a(n-10) +2955*a(n-11) +294*a(n-12) -1044*a(n-13) +55*a(n-14) +59*a(n-15) +2*a(n-16)
EXAMPLE
Some solutions for n=3
..1..1..1....2..0..1....1..1..2....0..3..0....0..2..0....1..1..0....2..2..0
..0..3..0....1..1..1....0..1..1....1..1..1....2..2..0....1..3..0....0..1..1
CROSSREFS
Sequence in context: A017450 A264267 A164756 * A298717 A058482 A114932
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 25 2013
STATUS
approved