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A234686 Number of (n+1)X(4+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant stress 1X1 tilings) 1
27344, 69336, 174320, 531984, 1602224, 5614248, 19258400, 74809368, 282312464, 1187833176, 4822708640, 21611172984, 92875010384, 437216431128, 1962918959840, 9597345360888, 44533050266384, 224048187428376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A234690

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..116

FORMULA

Empirical: a(n) = 8*a(n-1) +136*a(n-2) -1228*a(n-3) -7714*a(n-4) +83412*a(n-5) +227220*a(n-6) -3310020*a(n-7) -3144813*a(n-8) +85322244*a(n-9) -10139052*a(n-10) -1502272464*a(n-11) +1272592288*a(n-12) +18484107136*a(n-13) -25856757520*a(n-14) -159615082880*a(n-15) +298588477264*a(n-16) +954259846848*a(n-17) -2239825910784*a(n-18) -3795391531008*a(n-19) +11239750642176*a(n-20) +9072344881152*a(n-21) -37315540684800*a(n-22) -8727234969600*a(n-23) +78238462464000*a(n-24) -12303747072000*a(n-25) -93182607360000*a(n-26) +40370503680000*a(n-27) +47656304640000*a(n-28) -30098718720000*a(n-29)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A237381 A109481 A328214 * A064967 A168215 A224626

Adjacent sequences:  A234683 A234684 A234685 * A234687 A234688 A234689

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2013

STATUS

approved

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Last modified December 8 17:01 EST 2021. Contains 349596 sequences. (Running on oeis4.)