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A235315 Number of (n+1) X (4+1) 0..6 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 7 (constant-stress 1 X 1 tilings). 1
3920, 8392, 16352, 40144, 89600, 241600, 598976, 1723456, 4616960, 13917952, 39447872, 123109504, 363776000, 1165742080, 3555169856, 11629123456, 36344940800, 120802796032, 384900713792, 1295327764864, 4190699379200 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A235319.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

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=4:

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

  6 0 5 2 5     6 4 5 2 6     4 2 5 1 6     4 1 6 0 5

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

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

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

CROSSREFS

Sequence in context: A209732 A221239 A136459 * A229642 A266060 A034283

Adjacent sequences:  A235312 A235313 A235314 * A235316 A235317 A235318

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified August 11 05:13 EDT 2022. Contains 356046 sequences. (Running on oeis4.)