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A234241 Number of (n+1)X(1+1) 0..7 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant stress 1X1 tilings) 1
630, 6706, 72616, 790718, 8612920, 93934380, 1023822944, 11170450750, 121790634482, 1329240620840, 14497107132750, 158275185584352, 1726726741846356, 18858007382510560, 205796722132646470 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A234245

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +181*a(n-2) -1022*a(n-3) -7657*a(n-4) +21504*a(n-5) +54144*a(n-6) -96768*a(n-7) -80640*a(n-8)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A110904 A171258 A234245 * A185849 A058832 A225390

Adjacent sequences:  A234238 A234239 A234240 * A234242 A234243 A234244

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 21 2013

STATUS

approved

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Last modified May 22 05:57 EDT 2019. Contains 323474 sequences. (Running on oeis4.)