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A231243 Number of nX5 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero 1
0, 146, 3090, 76264, 1872136, 46019438, 1130422470, 27772974680, 682321382792, 16763244199326, 411838270131110, 10118017508760932, 248578825697527904, 6107069206409843814, 150038098056691694070, 3686126702598216458948 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 5 of A231246

LINKS

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

FORMULA

Empirical: a(n) = 15*a(n-1) +203*a(n-2) +785*a(n-3) +446*a(n-4) -8109*a(n-5) -27863*a(n-6) -32425*a(n-7) +67085*a(n-8) +92178*a(n-9) -67506*a(n-10) -164672*a(n-11) +79296*a(n-12) +123152*a(n-13) -58240*a(n-14) -80128*a(n-15) +113792*a(n-16) -18944*a(n-17) -11264*a(n-18) +3072*a(n-19)

EXAMPLE

Some solutions for n=4

..0..3..2..3..0....0..1..2..3..2....0..1..0..3..2....0..1..2..3..0

..2..1..0..1..0....2..3..0..1..2....2..3..0..1..2....0..1..0..1..0

..2..3..2..1..2....0..3..0..3..0....2..3..2..3..2....3..2..3..2..3

..0..1..0..3..0....0..1..2..1..2....2..1..0..1..0....3..0..1..0..1

CROSSREFS

Sequence in context: A183662 A183654 A183653 * A166219 A097728 A172877

Adjacent sequences: A231240 A231241 A231242 * A231244 A231245 A231246

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 06 2013

STATUS

approved

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Last modified December 7 12:56 EST 2022. Contains 358656 sequences. (Running on oeis4.)