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A221416 Number of n X 5 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two. 1
0, 84, 0, 17792, 0, 3813004, 0, 817415641, 0, 175230221888, 0, 37564072017396, 0, 8052596858631830, 0, 1726232153308945597, 0, 370051730646797787514, 0, 79327848710774305638388, 0, 17005480743351155889065248, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 5 of A221419.
LINKS
FORMULA
Empirical: a(n) = 276*a(n-2) -14620*a(n-4) +318164*a(n-6) -3590954*a(n-8) +22802458*a(n-10) -81585322*a(n-12) +150123806*a(n-14) -95749783*a(n-16) -40860150*a(n-18) +7351166*a(n-20) +978022*a(n-22) -197190*a(n-24) +7072*a(n-26).
EXAMPLE
Some solutions for n=4
..2..0..2..0..0....2..0..0..2..0....0..2..2..0..0....2..2..0..2..0
..2..2..2..2..0....0..2..0..2..0....2..0..0..2..2....0..0..0..2..0
..0..2..0..2..0....2..2..2..0..0....2..0..0..2..0....2..0..2..0..2
..0..2..0..2..0....2..0..0..2..2....2..2..0..0..2....0..2..2..0..2
CROSSREFS
Cf. A221419.
Sequence in context: A087532 A116307 A093676 * A130432 A317437 A304379
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 15 2013
STATUS
approved

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Last modified June 17 05:47 EDT 2024. Contains 373432 sequences. (Running on oeis4.)