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A237293 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the minimum minus the upper median minus the lower median of every 2X2 subblock equal 1
256, 1128, 5360, 27376, 145488, 802992, 4552384, 26458368, 156639808, 942349824, 5736317696, 35260388992, 218279005440, 1358969009152, 8495762042880, 53287015270400, 335031293455360, 2110452904770560, 13313109048823808 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237299

LINKS

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

FORMULA

Empirical: a(n) = 18*a(n-1) -80*a(n-2) -356*a(n-3) +3712*a(n-4) -3672*a(n-5) -46200*a(n-6) +121376*a(n-7) +223024*a(n-8) -1056416*a(n-9) -188480*a(n-10) +4472000*a(n-11) -2103552*a(n-12) -10322304*a(n-13) +8097920*a(n-14) +13459968*a(n-15) -12348928*a(n-16) -9893888*a(n-17) +8663040*a(n-18) +3891200*a(n-19) -2293760*a(n-20) -655360*a(n-21)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A237694 A237688 A237299 * A206118 A206111 A237211

Adjacent sequences:  A237290 A237291 A237292 * A237294 A237295 A237296

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 06 2014

STATUS

approved

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Last modified May 31 02:51 EDT 2020. Contains 334747 sequences. (Running on oeis4.)