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A235252 Number of (n+1)X(2+1) 0..7 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 7, with no adjacent elements equal (constant stress tilted 1X1 tilings) 1
744, 2592, 8328, 30300, 102000, 382036, 1330480, 5080484, 18163048, 70306060, 256589296, 1003233148, 3722094784, 14665343468, 55134285800, 218558955780, 830555412752, 3308709067460, 12685331083184, 50741901100676 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235258

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) +95*a(n-2) -616*a(n-3) -3917*a(n-4) +28162*a(n-5) +91198*a(n-6) -756656*a(n-7) -1296093*a(n-8) +13282950*a(n-9) +11064161*a(n-10) -160306388*a(n-11) -45638472*a(n-12) +1364159736*a(n-13) -85868097*a(n-14) -8277407564*a(n-15) +2248525953*a(n-16) +35930764870*a(n-17) -13377839510*a(n-18) -111621640828*a(n-19) +42805415777*a(n-20) +248607718870*a(n-21) -80775638437*a(n-22) -398463896692*a(n-23) +90040174737*a(n-24) +459694923182*a(n-25) -53415557378*a(n-26) -380977947608*a(n-27) +5163558960*a(n-28) +225617403088*a(n-29) +16935519648*a(n-30) -94279251328*a(n-31) -14034380336*a(n-32) +27080927712*a(n-33) +5672434272*a(n-34) -5079024000*a(n-35) -1315882368*a(n-36) +559194624*a(n-37) +167643648*a(n-38) -27371520*a(n-39) -9123840*a(n-40)

EXAMPLE

Some solutions for n=4

..7..4..7....5..1..2....5..6..5....4..0..5....3..1..5....2..4..1....2..5..2

..3..7..3....3..6..0....6..0..6....1..4..2....1..6..3....7..2..6....6..2..6

..6..3..6....6..2..3....1..2..1....4..0..5....4..2..6....2..4..1....1..4..1

..1..5..1....3..6..0....6..0..6....2..5..3....2..7..4....6..1..5....4..0..4

..7..4..7....4..0..1....4..5..4....6..2..7....5..3..7....3..5..2....0..3..0

CROSSREFS

Sequence in context: A331092 A235294 A331674 * A268891 A306281 A210178

Adjacent sequences:  A235249 A235250 A235251 * A235253 A235254 A235255

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified August 5 14:42 EDT 2021. Contains 346469 sequences. (Running on oeis4.)