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A237533 Number of (n+1)X(2+1) 0..3 arrays with the upper median minus the lower median of every 2X2 subblock equal 1
1692, 23680, 330210, 4857060, 70923320, 1050283590, 15572216080, 232373548624, 3478459510326, 52287525496440, 788422197696632, 11925360245325346, 180851239539089628, 2749259666023394272, 41880914986686188850 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A237538

LINKS

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

FORMULA

Empirical: a(n) = 47*a(n-1) -675*a(n-2) -810*a(n-3) +107490*a(n-4) -753870*a(n-5) -3728513*a(n-6) +65859073*a(n-7) -123687800*a(n-8) -2007587521*a(n-9) +10800711085*a(n-10) +16437340004*a(n-11) -264618937482*a(n-12) +369214865044*a(n-13) +2894230333829*a(n-14) -9979447783839*a(n-15) -10944096685319*a(n-16) +100654415455700*a(n-17) -69129777741518*a(n-18) -511744167031420*a(n-19) +978711927496840*a(n-20) +1107715147870232*a(n-21) -4746153386626400*a(n-22) +1182455795364544*a(n-23) +11288425244052672*a(n-24) -12064396386569728*a(n-25) -10967797365122048*a(n-26) +25840597232986112*a(n-27) -3924169727397888*a(n-28) -22676299835465728*a(n-29) +15318553143066624*a(n-30) +6317603403530240*a(n-31) -9914010538475520*a(n-32) +1568639825215488*a(n-33) +2013635656286208*a(n-34) -854911508021248*a(n-35) -16545757528064*a(n-36) +50490024919040*a(n-37) -4423816314880*a(n-38)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A062680 A251291 A120564 * A089674 A252429 A126720

Adjacent sequences:  A237530 A237531 A237532 * A237534 A237535 A237536

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 09 2014

STATUS

approved

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Last modified May 25 01:54 EDT 2019. Contains 323534 sequences. (Running on oeis4.)