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A235181 Number of (n+1)X(3+1) 0..5 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 5, with no adjacent elements equal (constant stress tilted 1X1 tilings) 1
576, 1400, 3240, 8224, 19952, 52328, 131120, 352000, 903544, 2468016, 6458176, 17881160, 47552704, 133129216, 359039112, 1014613904, 2770351216, 7892016840, 21785349232, 62495913056, 174180409272, 502718703312, 1412888840448 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A235186

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) +44*a(n-2) -133*a(n-3) -842*a(n-4) +2563*a(n-5) +9221*a(n-6) -28202*a(n-7) -64059*a(n-8) +195733*a(n-9) +296446*a(n-10) -893437*a(n-11) -937956*a(n-12) +2714749*a(n-13) +2064161*a(n-14) -5442684*a(n-15) -3205526*a(n-16) +7001040*a(n-17) +3522128*a(n-18) -5502080*a(n-19) -2622832*a(n-20) +2452848*a(n-21) +1173648*a(n-22) -555264*a(n-23) -271584*a(n-24) +48384*a(n-25) +24192*a(n-26)

EXAMPLE

Some solutions for n=4

..0..3..0..3....2..3..2..3....5..1..4..1....3..5..1..4....2..4..2..3

..4..2..4..2....4..0..4..0....3..4..2..4....5..2..3..1....4..1..4..0

..2..5..2..5....3..4..3..4....4..0..3..0....2..4..0..3....2..4..2..3

..3..1..3..1....4..0..4..0....3..4..2..4....4..1..2..0....5..2..5..1

..0..3..0..3....1..2..1..2....4..0..3..0....3..5..1..4....3..5..3..4

CROSSREFS

Sequence in context: A069266 A060678 A254848 * A268773 A250789 A137484

Adjacent sequences:  A235178 A235179 A235180 * A235182 A235183 A235184

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 04 2014

STATUS

approved

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Last modified January 18 06:42 EST 2022. Contains 350452 sequences. (Running on oeis4.)