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A220250 Sum of neighbor maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to the sum mod 3 of their king-move neighbors in a random 0..2 nX2 array 1
2, 16, 48, 256, 928, 4096, 15872, 65536, 259584, 1048576, 4182016, 16777216, 67051520, 268435456, 1073479680, 4294967296, 17178689536, 68719476736, 274872664064, 1099511627776, 4398023442432, 17592186044416, 70368643514368 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A220254

LINKS

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

FORMULA

Empirical: a(n)=4*a(n-1)+8*a(n-2)-32*a(n-3)-16*a(n-4)+64*a(n-5)

a(n) = 4^n - 2^(n-2)*(n+1)*(1-(-1)^n). - Vaclav Kotesovec, Jul 06 2013

EXAMPLE

Some solutions for n=3

..0..0....1..1....1..1....1..0....0..1....0..0....0..1....1..0....0..1....0..0

..0..1....0..1....0..0....0..0....1..1....0..0....0..0....0..0....0..1....0..1

..0..0....1..1....0..0....0..1....1..0....1..0....0..0....1..0....0..1....1..0

CROSSREFS

Sequence in context: A295533 A220173 A220801 * A192388 A162442 A159010

Adjacent sequences:  A220247 A220248 A220249 * A220251 A220252 A220253

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 08 2012

STATUS

approved

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Last modified October 3 09:59 EDT 2022. Contains 357231 sequences. (Running on oeis4.)