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A234819 Number of (n+1)X(4+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 6 (constant stress 1X1 tilings) 1
9716, 22098, 47136, 129384, 325424, 994812, 2794776, 9151956, 27722816, 95289828, 304241976, 1084006404, 3595734464, 13167262212, 44957454456, 168155707716, 587295900416, 2233218785028, 7943114997816, 30594914582724, 110455840695104 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A234823

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..208

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=4

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

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

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

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

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

CROSSREFS

Sequence in context: A204343 A068362 A246228 * A236795 A061659 A206631

Adjacent sequences:  A234816 A234817 A234818 * A234820 A234821 A234822

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 31 2013

STATUS

approved

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Last modified November 28 05:17 EST 2020. Contains 338699 sequences. (Running on oeis4.)