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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A221780

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..34

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

Adjacent sequences:  A221778 A221779 A221780 * A221782 A221783 A221784

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 25 2013

STATUS

approved

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Last modified October 5 05:10 EDT 2022. Contains 357252 sequences. (Running on oeis4.)