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A235317 Number of (n+1)X(6+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 7 (constant stress 1X1 tilings) 1
41216, 71896, 118160, 241600, 459536, 1062832, 2291696, 5805424, 13828496, 37480816, 96320240, 274905520, 748476176, 2225038192, 6336650096, 19467254704, 57471337616, 181369764976, 551385678320, 1778749067440, 5539587136016 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A235319

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..68

FORMULA

Empirical: a(n) = 4*a(n-1) +47*a(n-2) -200*a(n-3) -901*a(n-4) +4204*a(n-5) +8957*a(n-6) -48440*a(n-7) -47194*a(n-8) +334096*a(n-9) +101948*a(n-10) -1410080*a(n-11) +170136*a(n-12) +3549696*a(n-13) -1446912*a(n-14) -4861440*a(n-15) +2954880*a(n-16) +2764800*a(n-17) -2073600*a(n-18)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A183667 A188488 A027577 * A294986 A269738 A269737

Adjacent sequences:  A235314 A235315 A235316 * A235318 A235319 A235320

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified May 24 04:25 EDT 2019. Contains 323528 sequences. (Running on oeis4.)