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A235579 Number of (n+1)X(1+1) 0..3 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order rowwise and columnwise 2
256, 2896, 29902, 283672, 2573798, 22515040, 192101098, 1606970816, 13241328464, 107791850352, 868939726164, 6948437293776, 55190272360908, 435883708681040, 3425905431290298, 26814545618470232, 209120413244975698 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A235582
LINKS
FORMULA
Empirical: a(n) = 16*a(n-1) -1088*a(n-3) +2822*a(n-4) +32220*a(n-5) -115405*a(n-6) -550832*a(n-7) +2287907*a(n-8) +6094288*a(n-9) -27451466*a(n-10) -46518640*a(n-11) +215602416*a(n-12) +255565900*a(n-13) -1144084105*a(n-14) -1037102496*a(n-15) +4127924328*a(n-16) +3118730008*a(n-17) -9990319584*a(n-18) -6756169120*a(n-19) +15678479104*a(n-20) +9914486656*a(n-21) -15072576768*a(n-22) -9022539264*a(n-23) +8159504384*a(n-24) +4603113472*a(n-25) -2141929472*a(n-26) -1129512960*a(n-27) +192675840*a(n-28) +94371840*a(n-29)
EXAMPLE
Some solutions for n=3
..2..2....0..3....3..2....2..1....2..0....2..1....1..3....1..1....3..1....1..1
..2..1....0..1....0..2....2..1....0..0....2..0....1..1....1..0....3..2....1..0
..3..1....2..3....0..3....3..0....0..2....3..0....0..0....2..0....1..3....2..0
..0..2....0..2....2..2....2..2....0..1....3..2....3..2....2..3....3..2....3..2
CROSSREFS
Sequence in context: A235824 A235582 A236657 * A236654 A236198 A236195
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 12 2014
STATUS
approved

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Last modified February 23 08:34 EST 2024. Contains 370272 sequences. (Running on oeis4.)