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A237931 Number of (n+1)X(1+1) 0..3 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
256, 1718, 11701, 81402, 563166, 3880918, 26804881, 185489824, 1282099556, 8852862392, 61169759404, 422870170848, 2922385929712, 20190059774152, 139517455447976, 964213093638072, 6663225933024004, 46041769193957056 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237936

LINKS

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

FORMULA

Empirical: a(n) = 1888*a(n-4) +26908*a(n-6) -301104*a(n-8) -4523964*a(n-10) +9356144*a(n-12) +158092496*a(n-14) +15024960*a(n-16) -2150807552*a(n-18) -1973442560*a(n-20) +11283515392*a(n-22) +13873016832*a(n-24) -19456245760*a(n-26) -21131821056*a(n-28) +10415243264*a(n-30) +385875968*a(n-32) -96468992*a(n-34) -16777216*a(n-36)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A237175 A237169 A237936 * A237494 A237489 A238054

Adjacent sequences:  A237928 A237929 A237930 * A237932 A237933 A237934

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 16 2014

STATUS

approved

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Last modified October 3 04:11 EDT 2022. Contains 357230 sequences. (Running on oeis4.)