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A237862 Number of (n+1)X(2+1) 0..2 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
336, 1944, 11454, 68830, 405758, 2385956, 14144254, 84226372, 497945422, 2940973430, 17431426946, 103443591278, 612177964814, 3621788292858, 21459113612280, 127184449153574, 753001553319016, 4457885969403098 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A237868

LINKS

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

FORMULA

Empirical: a(n) = 48*a(n-3) +764*a(n-4) +1113*a(n-5) +2630*a(n-6) -1330*a(n-7) -76808*a(n-8) -103834*a(n-9) +42139*a(n-10) +213170*a(n-11) +624044*a(n-12) +404402*a(n-13) -474767*a(n-14) -1195423*a(n-15) -845864*a(n-16) -233832*a(n-17) -278031*a(n-18) +2684781*a(n-19) -785243*a(n-20) +690749*a(n-21) +16053*a(n-22) -191039*a(n-23) -140612*a(n-24) -402983*a(n-25) +152122*a(n-26) -120738*a(n-27) -14602*a(n-28) +3372*a(n-29) +2280*a(n-30) -1368*a(n-31) +264*a(n-32) +128*a(n-33)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A006909 A067708 A059467 * A268807 A159206 A251066

Adjacent sequences:  A237859 A237860 A237861 * A237863 A237864 A237865

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 14 2014

STATUS

approved

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Last modified March 20 23:22 EDT 2019. Contains 321354 sequences. (Running on oeis4.)