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A232426 Number of (n+1)X(2+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally or vertically 1
16, 192, 1632, 14592, 132980, 1222708, 11215820, 102219940, 933038584, 8540079344, 78067411340, 713247261668, 6518908174356, 59590575250044, 544659989843968, 4977988468360184, 45498912754793708, 415866178060623508 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A232431

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 5*a(n-1) +14*a(n-2) +177*a(n-3) +593*a(n-4) -762*a(n-5) -9725*a(n-6) -19491*a(n-7) +50600*a(n-8) -46439*a(n-9) -300305*a(n-10) +356396*a(n-11) +708476*a(n-12) +1239102*a(n-13) -2382756*a(n-14) +350424*a(n-15) +2450976*a(n-16) -5740800*a(n-17) +1144832*a(n-18) -1454080*a(n-19) -884736*a(n-20) +262144*a(n-21)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A317122 A230832 A305590 * A317008 A316873 A071081

Adjacent sequences:  A232423 A232424 A232425 * A232427 A232428 A232429

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 23 2013

STATUS

approved

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Last modified May 19 04:20 EDT 2022. Contains 353826 sequences. (Running on oeis4.)