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A236495 Number of (n+1)X(1+1) 0..3 arrays colored with the sum of the maximum and minimum values of each 2X2 subblock 1
256, 2228, 19856, 171436, 1503360, 13078180, 114229184, 995583500, 8688160944, 75762394644, 660932725968, 5764551429420, 50283755683392, 438589701233540, 3825664710332480, 33369191924137804, 291064911609837232 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236500

LINKS

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

FORMULA

Empirical: a(n) = 32*a(n-2) +208*a(n-3) +1222*a(n-4) +2448*a(n-5) +2716*a(n-6) +944*a(n-7) -681*a(n-8) -1944*a(n-9) -1248*a(n-10) -512*a(n-11) for n>12

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A207799 A207792 A236500 * A236118 A236113 A235521

Adjacent sequences:  A236492 A236493 A236494 * A236496 A236497 A236498

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2014

STATUS

approved

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Last modified October 20 10:43 EDT 2021. Contains 348100 sequences. (Running on oeis4.)