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A236812 Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the lower median minus the minimum of every 2X2 subblock equal 1
81, 303, 1162, 4627, 18527, 75330, 307321, 1264403, 5216986, 21640527, 89986987, 375549402, 1570552173, 6585201767, 27658875370, 116397378211, 490534291751, 2070328353634, 8748087545329, 37007121293131, 156698572216250 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236819

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -2*a(n-2) -181*a(n-3) +349*a(n-4) +1204*a(n-5) -3474*a(n-6) -2856*a(n-7) +13672*a(n-8) -432*a(n-9) -24464*a(n-10) +10352*a(n-11) +18944*a(n-12) -11968*a(n-13) -4736*a(n-14) +3584*a(n-15)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A237772 A236819 A237099 * A237092 A206277 A236018

Adjacent sequences: A236809 A236810 A236811 * A236813 A236814 A236815

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 31 2014

STATUS

approved

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Last modified November 29 02:51 EST 2022. Contains 358421 sequences. (Running on oeis4.)