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A234818 Number of (n+1)X(3+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 6 (constant stress 1X1 tilings) 1
2380, 6282, 15224, 47136, 131704, 443220, 1352816, 4791948, 15484360, 56779452, 190677584, 716514876, 2473383304, 9461029980, 33344399696, 129230455548, 462955104520, 1811799391452, 6576906075344, 25926079006716, 95144821863304 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A234823

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +60*a(n-2) -620*a(n-3) -1210*a(n-4) +20740*a(n-5) +1580*a(n-6) -392180*a(n-7) +353267*a(n-8) +4606324*a(n-9) -7135240*a(n-10) -34677440*a(n-11) +72387960*a(n-12) +165390560*a(n-13) -443380480*a(n-14) -464032320*a(n-15) +1696321584*a(n-16) +566607168*a(n-17) -3948347520*a(n-18) +465384960*a(n-19) +5084985600*a(n-20) -2142028800*a(n-21) -2757888000*a(n-22) +1741824000*a(n-23)

EXAMPLE

Some solutions for n=5

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

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

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

..0..5..0..2....3..4..3..4....5..2..5..2....3..0..2..0....4..0..4..0

..5..4..5..1....5..0..5..0....1..4..1..4....1..4..0..4....3..5..3..5

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

CROSSREFS

Sequence in context: A255800 A252469 A252420 * A107530 A020394 A251649

Adjacent sequences:  A234815 A234816 A234817 * A234819 A234820 A234821

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 31 2013

STATUS

approved

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Last modified January 27 21:45 EST 2022. Contains 350654 sequences. (Running on oeis4.)