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A238148 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
256, 1608, 10664, 72584, 499560, 3342416, 22488016, 152285824, 1043035504, 6998475712, 47273279296, 319462663168, 2181201937664, 14658851660800, 99259562449664, 669930900621824, 4565506277964288, 30712312453320704 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A238155

LINKS

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

FORMULA

Empirical: a(n) = 1728*a(n-4) +17152*a(n-6) -2064*a(n-8) -513920*a(n-10) -1449280*a(n-12) -772864*a(n-14) +601600*a(n-16) +334848*a(n-18) -331776*a(n-20) for n>21

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A251974 A250429 A238155 * A237927 A237922 A238072

Adjacent sequences:  A238145 A238146 A238147 * A238149 A238150 A238151

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 18 2014

STATUS

approved

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Last modified February 19 10:03 EST 2020. Contains 332041 sequences. (Running on oeis4.)