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A203873 Number of (n+1)X4 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order 1
487, 23815, 1166887, 57177415, 2801693287, 137282971015, 6726865579687, 329616413404615, 16151204256826087, 791409008584478215, 38779041420639432487, 1900173029611332191815, 93108478450955277398887 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A203878
LINKS
FORMULA
Empirical: a(n) = 486*49^(n-1) +1
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..0..0....0..1..0..0....0..1..2..3....0..1..1..0
..1..1..2..1....1..1..2..1....2..2..3..2....2..3..2..1....0..2..2..2
..2..3..0..0....0..3..2..3....1..1..0..0....1..3..0..3....3..3..1..1
..1..3..2..2....0..1..0..0....3..2..2..3....1..3..1..3....0..0..2..3
..0..3..1..1....2..1..2..1....3..1..1..3....0..2..1..2....3..1..1..3
CROSSREFS
Sequence in context: A255207 A236424 A235839 * A097766 A214806 A126819
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 07 2012
STATUS
approved

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Last modified March 1 18:30 EST 2024. Contains 370443 sequences. (Running on oeis4.)