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A232338 Number of 4Xn 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally, with no adjacent elements equal 1
1, 42, 308, 734, 4906, 13170, 82526, 239992, 1398710, 4333362, 23808020, 77703762, 406751730, 1385692672, 6971295054, 24603895150, 119805137680, 435349233940, 2063663956954, 7681867046626, 35616414149972, 135245995065394 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A232335

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +15*a(n-2) -7*a(n-3) +8*a(n-4) -40*a(n-5) +8*a(n-6) -14*a(n-7) +38*a(n-8) +12*a(n-9) +3*a(n-10) -11*a(n-11) -27*a(n-12) +7*a(n-13) -6*a(n-14) +20*a(n-15) -5*a(n-16) +5*a(n-17) -7*a(n-18) +a(n-19) -a(n-20) +a(n-21) for n>24

EXAMPLE

Some solutions for n=7

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

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

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

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

CROSSREFS

Sequence in context: A272139 A167654 A095266 * A252937 A033277 A190533

Adjacent sequences:  A232335 A232336 A232337 * A232339 A232340 A232341

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 22 2013

STATUS

approved

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Last modified May 28 15:04 EDT 2022. Contains 354115 sequences. (Running on oeis4.)