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A234560 Number of (n+1)X(4+1) 0..4 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 4 (constant stress 1X1 tilings) 1
1954, 3384, 5710, 11982, 23830, 57210, 128614, 339234, 831334, 2348514, 6096550, 18108882, 48774790, 150230370, 414112774, 1309321074, 3662050534, 11801192514, 33312585190, 108877827282, 309161287750, 1021316064930, 2911094369734 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A234564

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +30*a(n-2) -132*a(n-3) -331*a(n-4) +1720*a(n-5) +1530*a(n-6) -11280*a(n-7) -1324*a(n-8) +39136*a(n-9) -12360*a(n-10) -67968*a(n-11) +39456*a(n-12) +46080*a(n-13) -34560*a(n-14)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A249217 A155809 A116211 * A232389 A209946 A200857

Adjacent sequences:  A234557 A234558 A234559 * A234561 A234562 A234563

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 28 2013

STATUS

approved

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Last modified June 17 19:28 EDT 2021. Contains 345085 sequences. (Running on oeis4.)