A268070 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A268070

Number of nX2 0..3 arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order.

2, 15, 159, 2191, 30295, 421471, 5797959, 79367143, 1079774311, 14630901175, 197520668295, 2659138662775, 35714778101863, 478783751931415, 6408527754114375, 85670414104756855, 1144076540594898727

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 2 of A268073.

LINKS

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

FORMULA

Empirical: a(n) = 26*a(n-1) -109*a(n-2) -1668*a(n-3) +10384*a(n-4) +30340*a(n-5) -193268*a(n-6) -33480*a(n-7) +882432*a(n-8) -461376*a(n-9) -1073088*a(n-10) +839808*a(n-11) for n>13

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A268073.

Sequence in context: A124548 A324463 A139085 * A204679 A363564 A364331

Adjacent sequences: A268067 A268068 A268069 * A268071 A268072 A268073

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 25 2016

STATUS

approved