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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

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

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

Adjacent sequences:  A203870 A203871 A203872 * A203874 A203875 A203876

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2012

STATUS

approved

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Last modified January 24 01:05 EST 2020. Contains 331178 sequences. (Running on oeis4.)