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A234817 Number of (n+1)X(2+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 6 (constant stress 1X1 tilings) 1
686, 2220, 6282, 22098, 68570, 252486, 828354, 3136350, 10660586, 41107950, 143165922, 559043598, 1982378090, 7810154766, 28090231074, 111378700110, 405255972266, 1614238905870, 5930740315362, 23700937672398, 87799125560810 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A116219 A232199 A222751 * A203459 A101944 A045150

Adjacent sequences:  A234814 A234815 A234816 * A234818 A234819 A234820

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 31 2013

STATUS

approved

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Last modified January 19 05:41 EST 2022. Contains 350464 sequences. (Running on oeis4.)