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A237143 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the lower median of every 2X2 subblock equal 1
256, 1472, 8128, 48672, 289648, 1763648, 10742400, 65979616, 405858928, 2506483648, 15505832064, 96161190176, 597347413104, 3717660452416, 23173286559360, 144674835765600, 904520172987504, 5663029113486528 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237150

LINKS

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

FORMULA

Empirical: a(n) = 15*a(n-1) +15*a(n-2) -1145*a(n-3) +2387*a(n-4) +37971*a(n-5) -125157*a(n-6) -717925*a(n-7) +2961789*a(n-8) +8497725*a(n-9) -42143099*a(n-10) -64302155*a(n-11) +395479985*a(n-12) +292816593*a(n-13) -2542859159*a(n-14) -536734167*a(n-15) +11318363232*a(n-16) -2143673968*a(n-17) -34416928152*a(n-18) +18241618944*a(n-19) +68291364640*a(n-20) -59473522432*a(n-21) -78323431552*a(n-22) +105248727808*a(n-23) +31220975104*a(n-24) -96325931008*a(n-25) +27167551488*a(n-26) +30305468416*a(n-27) -24934612992*a(n-28) +7018905600*a(n-29) -707788800*a(n-30)

EXAMPLE

Some solutions for n=4

..1..0....2..0....1..3....0..2....2..3....3..1....2..3....2..3....0..3....0..2

..1..2....2..3....1..2....2..2....2..3....2..3....1..3....2..3....0..2....2..3

..1..2....2..0....3..1....2..1....1..2....2..1....3..2....3..1....2..1....2..3

..0..1....2..3....1..1....3..1....3..2....3..3....0..2....2..3....1..2....2..0

..2..2....3..0....3..1....0..2....0..2....2..2....2..3....1..2....2..1....2..3

CROSSREFS

Sequence in context: A237488 A237482 A237150 * A333606 A237974 A237967

Adjacent sequences:  A237140 A237141 A237142 * A237144 A237145 A237146

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 04 2014

STATUS

approved

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Last modified October 5 08:38 EDT 2022. Contains 357252 sequences. (Running on oeis4.)