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A234222 Number of (n+1)X(3+1) 0..4 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 3 (constant stress 1X1 tilings) 1
1824, 5612, 17448, 56936, 188040, 648536, 2264904, 8215256, 30142344, 114224792, 436849608, 1716521816, 6787144200, 27449810456, 111385692744, 460731399896, 1906999712904, 8026422662552, 33728591085768, 143889611473496 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A234227

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) +20*a(n-2) -390*a(n-3) +460*a(n-4) +5520*a(n-5) -14240*a(n-6) -26400*a(n-7) +115776*a(n-8) -13824*a(n-9) -299520*a(n-10) +276480*a(n-11)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A256076 A179581 A230052 * A233813 A249536 A124073

Adjacent sequences:  A234219 A234220 A234221 * A234223 A234224 A234225

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 21 2013

STATUS

approved

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Last modified February 25 12:00 EST 2021. Contains 341606 sequences. (Running on oeis4.)