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A237953 Number of (n+1)X(2+1) 0..3 arrays with the maximum plus the upper median plus the lower median plus the minimum of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
1280, 7552, 45504, 300576, 1989792, 13448144, 90873216, 619311968, 4216944960, 28740190112, 195754182912, 1336638450880, 9119759264640, 62187152129600, 423811971529728, 2894195784272640, 19749810069474816, 134677433485842176 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A237956

LINKS

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

FORMULA

Empirical: a(n) = 2748*a(n-4) -1387988*a(n-8) +288215016*a(n-12) -28573068288*a(n-16) +1342200998400*a(n-20) -26806577111808*a(n-24) +258758317983744*a(n-28) -1294957173878784*a(n-32) +3352065764917248*a(n-36) -4028458590535680*a(n-40) +1526567264059392*a(n-44) for n>46

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A234315 A251783 A224645 * A237236 A090006 A170784

Adjacent sequences:  A237950 A237951 A237952 * A237954 A237955 A237956

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 16 2014

STATUS

approved

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Last modified January 18 19:30 EST 2020. Contains 331029 sequences. (Running on oeis4.)