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A237135 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median of every 2X2 subblock equal 1
256, 1500, 8414, 52484, 328768, 2145192, 14152560, 95414944, 649185798, 4478130100, 31091450584, 217843944144, 1532986230904, 10852686898168, 77047991907070, 549127517842812, 3920693547270496, 28062818940398024 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237142

LINKS

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

FORMULA

Empirical: a(n) = 16*a(n-1) -1186*a(n-3) +4300*a(n-4) +29836*a(n-5) -178043*a(n-6) -268628*a(n-7) +3127196*a(n-8) -779130*a(n-9) -28579040*a(n-10) +32590712*a(n-11) +142648608*a(n-12) -254087072*a(n-13) -375342992*a(n-14) +955527424*a(n-15) +408264640*a(n-16) -1902301152*a(n-17) +178371840*a(n-18) +1899365760*a(n-19) -742376448*a(n-20) -734054400*a(n-21) +418037760*a(n-22)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A237974 A237967 A237142 * A197709 A198073 A197907

Adjacent sequences:  A237132 A237133 A237134 * A237136 A237137 A237138

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 04 2014

STATUS

approved

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Last modified December 1 04:32 EST 2021. Contains 349426 sequences. (Running on oeis4.)