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A222445 Sum of neighbor maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to the sum mod 4 of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nX2 array 1
2, 14, 64, 210, 1024, 4000, 16288, 65536, 260080, 1048576, 4191744, 16774656, 67108864, 268379104, 1073741824, 4294909952, 17179811840, 68719476736, 274876642816, 1099511627776, 4398045331456, 17592184864768, 70368744177664 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A222448

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +60*a(n-5) -240*a(n-6) -1456*a(n-10) +5824*a(n-11) +18496*a(n-15) -73984*a(n-16) -133120*a(n-20) +532480*a(n-21) +544768*a(n-25) -2179072*a(n-26) -1179648*a(n-30) +4718592*a(n-31) +1048576*a(n-35) -4194304*a(n-36)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A217154 A144657 A167555 * A181394 A266590 A196977

Adjacent sequences:  A222442 A222443 A222444 * A222446 A222447 A222448

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 20 2013

STATUS

approved

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Last modified February 17 12:29 EST 2020. Contains 331996 sequences. (Running on oeis4.)