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A235574 Number of (n+1)X(1+1) 0..3 arrays with the difference of the upper and lower median value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise 2
256, 2894, 28978, 268448, 2377726, 20374112, 170668898, 1404828230, 11413317704, 91766116488, 731808519584, 5797224998624, 45676273081688, 358272122900606, 2799733458956666, 21810268527215416, 169456934940212246 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A235577
LINKS
FORMULA
Empirical: a(n) = 16*a(n-1) -28*a(n-2) -667*a(n-3) +2717*a(n-4) +9004*a(n-5) -55228*a(n-6) -31261*a(n-7) +479324*a(n-8) -256716*a(n-9) -1907096*a(n-10) +2311456*a(n-11) +2958880*a(n-12) -6158976*a(n-13) +410112*a(n-14) +5138432*a(n-15) -3686400*a(n-16) +786432*a(n-17)
EXAMPLE
Some solutions for n=3
..1..1....1..2....2..0....2..0....3..0....3..1....0..2....2..0....1..1....1..0
..3..0....2..2....1..2....1..1....1..1....2..2....1..2....1..0....2..1....3..2
..1..1....2..1....1..3....0..1....2..3....3..0....1..3....0..3....3..3....0..3
..1..2....2..0....3..0....3..1....0..3....2..3....0..0....0..2....0..2....0..1
CROSSREFS
Sequence in context: A236585 A235818 A235577 * A235824 A235582 A236657
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 12 2014
STATUS
approved

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Last modified February 24 07:07 EST 2024. Contains 370294 sequences. (Running on oeis4.)