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A236296 Number of (n+1)X(1+1) 0..3 arrays colored with the maximum plus the upper median plus the minimum of every 2X2 subblock 1
256, 3040, 36192, 432292, 5161664, 61594004, 735086888, 8773890972, 104720819952, 1249859692764, 14917390553320, 178044031444660, 2125010749541696, 25362620152707220, 302710385864023592 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236299

LINKS

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

FORMULA

Empirical: a(n) = 496*a(n-3) +6976*a(n-4) +48436*a(n-5) +329216*a(n-6) +1437760*a(n-7) +3979634*a(n-8) +4940132*a(n-9) -55741792*a(n-10) -390877624*a(n-11) -1473869888*a(n-12) -4031176420*a(n-13) -1262305248*a(n-14) +33517081024*a(n-15) +155320073087*a(n-16) +472592340348*a(n-17) +530125840256*a(n-18) -1501534470840*a(n-19) -8023945719440*a(n-20) -23066155324272*a(n-21) -26970122998624*a(n-22) +53711172706752*a(n-23) +248959902556160*a(n-24) +532406307593472*a(n-25) +455715391093696*a(n-26) -1386551094356224*a(n-27) -4426082018291456*a(n-28) -5065787868470272*a(n-29) +38737497779200*a(n-30) +16628061270116352*a(n-31) +32449752313597952*a(n-32) +10910755550486528*a(n-33) -35673387072094208*a(n-34) -63851414223945728*a(n-35) -61910833253777408*a(n-36) +15490979644964864*a(n-37) +124304876301189120*a(n-38) +83968026177175552*a(n-39) -54274400025837568*a(n-40) -73655933378494464*a(n-41) -4669132624625664*a(n-42) +18475093453701120*a(n-43) +4665135561965568*a(n-44) -1358607509618688*a(n-45) -458848267665408*a(n-46)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A235430 A235426 A236299 * A138333 A236123 A236120

Adjacent sequences:  A236293 A236294 A236295 * A236297 A236298 A236299

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 21 2014

STATUS

approved

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Last modified January 15 09:54 EST 2021. Contains 340187 sequences. (Running on oeis4.)