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A234328 Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 1 (constant stress 1X1 tilings) 1
2368, 25728, 287888, 3271560, 37234216, 425662432, 4858165384, 55631535036, 635692080136, 7287762748412, 83358262956160, 956674989178676, 10953011278383544, 125838143389011112, 1442087851946088992 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A234333

LINKS

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

FORMULA

Empirical: a(n) = 507*a(n-2) -102295*a(n-4) +10646830*a(n-6) -635915377*a(n-8) +23832852746*a(n-10) -596280829182*a(n-12) +10371633339873*a(n-14) -128744093807520*a(n-16) +1159671655063068*a(n-18) -7660667577596808*a(n-20) +37368059037902308*a(n-22) -135219186772494408*a(n-24) +364034788822163472*a(n-26) -730004249849579520*a(n-28) +1089413122161376064*a(n-30) -1205481757762071168*a(n-32) +981742220067000064*a(n-34) -581000394777277440*a(n-36) +244895745327540224*a(n-38) -71316845470162944*a(n-40) +13706205520330752*a(n-42) -1618885433491456*a(n-44) +103796813856768*a(n-46) -2721872609280*a(n-48)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A186785 A185607 A068282 * A258520 A232906 A241933

Adjacent sequences:  A234325 A234326 A234327 * A234329 A234330 A234331

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 23 2013

STATUS

approved

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Last modified September 25 19:48 EDT 2017. Contains 292500 sequences.