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A234821 Number of (n+1)X(6+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 6 (constant stress 1X1 tilings) 1
139112, 252486, 443220, 994812, 2099300, 5441232, 13185612, 37597992, 100759412, 307659576, 887665260, 2856356952, 8711766260, 29230410072, 93082415532, 323139754392, 1065130800692, 3802624291416, 12891708917100, 47097845952792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A234823

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..34

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=1

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

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

CROSSREFS

Sequence in context: A236276 A250713 A236063 * A221669 A145207 A236745

Adjacent sequences:  A234818 A234819 A234820 * A234822 A234823 A234824

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 31 2013

STATUS

approved

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Last modified January 25 19:00 EST 2022. Contains 350572 sequences. (Running on oeis4.)