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A236896 Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the upper median of every 2X2 subblock equal 1
339, 3205, 30644, 337861, 3782769, 43538228, 504121651, 5869125835, 68447883704, 799193185177, 9335513529061, 109078340464240, 1274639900671115, 14895774356170087, 174080704237509648, 2034438282599485301 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A236902

LINKS

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

FORMULA

Empirical: a(n) = 20*a(n-1) -50*a(n-2) -1079*a(n-3) +5929*a(n-4) +13546*a(n-5) -136152*a(n-6) +32559*a(n-7) +1230196*a(n-8) -1321510*a(n-9) -5558982*a(n-10) +8606104*a(n-11) +13433556*a(n-12) -26908536*a(n-13) -16223728*a(n-14) +45800336*a(n-15) +5469360*a(n-16) -41824640*a(n-17) +6747552*a(n-18) +17907200*a(n-19) -5889280*a(n-20) -2304000*a(n-21) +921600*a(n-22)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A158000 A252447 A252441 * A076748 A306865 A205223

Adjacent sequences:  A236893 A236894 A236895 * A236897 A236898 A236899

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 01 2014

STATUS

approved

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Last modified January 19 00:03 EST 2021. Contains 340262 sequences. (Running on oeis4.)