A221408 -id:A221408 - cp's OEIS frontend

A221404 Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

0, 16, 0, 436, 0, 12668, 0, 368268, 0, 10705360, 0, 311197280, 0, 9046269888, 0, 262968117056, 0, 7644280337936, 0, 222213327464336, 0, 6459569820912704, 0, 187774705858714240, 0, 5458465675503960896, 0, 158673381440822516672, 0

Offset: 1

R. H. Hardin Jan 15 2013

nonn

Column 3 of A221408

			Some solutions for n=4
..0..2..0....2..0..2....2..0..2....0..2..0....0..2..0....2..0..0....0..2..2
..2..0..0....2..0..0....0..0..2....0..0..2....0..2..0....0..2..2....0..0..0
..2..2..2....0..0..2....0..0..2....2..2..2....2..0..2....0..0..0....2..0..2
..0..2..0....2..2..0....2..0..2....0..0..2....2..0..2....2..2..2....2..2..0

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

Empirical: a(n) = 36*a(n-2) -200*a(n-4) -40*a(n-6) -84*a(n-8) +80*a(n-10) -20*a(n-12) +80*a(n-14)

A221405 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

Original entry on oeis.org

4, 44, 436, 4518, 47156, 492102, 5133044, 53529806, 558164472, 5819704716, 60677191216, 632619159318, 6595610902832, 68764677891112, 716926331557236, 7474513869766556, 77927543824707370, 812454058048811426

Offset: 1

R. H. Hardin Jan 15 2013

nonn

Column 4 of A221408

			Some solutions for n=3
..0..2..2..0....0..2..0..2....2..2..0..2....2..2..0..2....0..2..0..0
..2..2..0..0....0..2..0..2....0..0..0..2....0..2..0..0....2..0..0..2
..0..0..2..2....2..0..0..2....2..2..0..0....2..0..2..0....2..2..2..0

R. H. Hardin, Table of n, a(n) for n = 1..94

Empirical: a(n) = 19*a(n-1) -110*a(n-2) +250*a(n-3) -446*a(n-4) +939*a(n-5) -1112*a(n-6) -343*a(n-7) -822*a(n-8) +692*a(n-9) +1957*a(n-10) +2810*a(n-11) -1975*a(n-12) -59*a(n-13) -2679*a(n-14) +738*a(n-15) +1088*a(n-16) +1258*a(n-17) -418*a(n-18) -562*a(n-19) +192*a(n-20) +336*a(n-21) +32*a(n-22) -32*a(n-23)

A221406 Number of nX5 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

Original entry on oeis.org

0, 120, 0, 47156, 0, 18852560, 0, 7505597654, 0, 2984164922226, 0, 1185951960926210, 0, 471249297474390114, 0, 187247029623260170674, 0, 74400007192624944055794, 0, 29561675588644660921885852, 0

Offset: 1

R. H. Hardin Jan 15 2013

nonn

Column 5 of A221408

			Some solutions for n=4
..2..0..2..2..2....0..2..0..2..2....2..0..2..2..2....2..0..0..2..2
..0..0..2..0..0....0..2..0..2..0....0..0..0..2..0....0..2..0..0..2
..2..0..0..0..2....0..0..0..2..0....0..2..0..2..0....2..0..2..2..0
..2..0..2..0..2....2..2..2..2..0....2..0..2..2..0....2..0..0..0..2

R. H. Hardin, Table of n, a(n) for n = 1..28

A221407 Number of nX6 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

Original entry on oeis.org

8, 328, 12668, 492102, 18852560, 722442370, 27665242848, 1058237377670

Offset: 1

R. H. Hardin Jan 15 2013

nonn

Column 6 of A221408

			Some solutions for n=3
..0..0..2..0..2..2....0..0..2..2..0..2....2..2..0..2..0..2....2..0..0..0..2..0
..2..0..0..2..0..0....2..0..2..0..0..2....2..0..0..2..0..0....2..2..2..2..2..0
..2..0..2..2..0..2....0..2..2..0..0..2....0..2..2..0..2..0....0..0..2..0..0..2

cp's OEIS Frontend

A221404 Number of nX3 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

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A221405 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

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A221406 Number of nX5 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

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A221407 Number of nX6 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, with every occupancy equal to zero or two.

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