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 A235290 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 3 (constant stress 1X1 tilings) 0
 40, 232, 832, 3184, 9568, 32992, 97888, 333952, 1044640, 3677632 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A235301 LINKS FORMULA Empirical: a(n) = 4*a(n-1) +23*a(n-2) -92*a(n-3) -200*a(n-4) +800*a(n-5) +820*a(n-6) -3280*a(n-7) -1584*a(n-8) +6336*a(n-9) +1152*a(n-10) -4608*a(n-11) [see A235301 for assumption] EXAMPLE Some solutions for n=5 ..2..0..0..0..0..0....3..3..3..3..2..3....1..3..2..3..3..3....3..1..3..1..3..1 ..2..3..0..3..0..3....3..0..3..0..2..0....1..0..2..0..3..0....1..2..1..2..1..2 ..3..1..1..1..1..1....1..1..1..1..0..1....1..3..2..3..3..3....3..1..3..1..3..1 ..2..3..0..3..0..3....3..0..3..0..2..0....1..0..2..0..3..0....1..2..1..2..1..2 ..2..0..0..0..0..0....3..3..3..3..2..3....1..3..2..3..3..3....2..0..2..0..2..0 ..2..3..0..3..0..3....3..0..3..0..2..0....1..0..2..0..3..0....1..2..1..2..1..2 CROSSREFS Sequence in context: A072108 A218404 A235010 * A074360 A235885 A068790 Adjacent sequences:  A235287 A235288 A235289 * A235291 A235292 A235293 KEYWORD nonn AUTHOR R. H. Hardin, Jan 05 2014 STATUS approved

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Last modified January 20 03:25 EST 2022. Contains 350467 sequences. (Running on oeis4.)