A203821 Number of (n+1)X4 0..3 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements

11664, 571536, 28005264, 1372257936, 67240638864, 3294791304336, 161444773912464, 7910793921710736, 387628902163826064, 18993816206027477136, 930696994095346379664, 45604152710671972603536

Offset

1,1

Comments

Column 3 of A203826

Links

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

Formula

Empirical: a(n) = 11664*49^(n-1)

Example

Some solutions for n=4
..2..1..1..2....0..2..0..1....1..3..3..0....2..3..1..1....3..1..1..2
..2..3..3..2....3..3..0..1....0..2..1..1....1..3..0..3....0..2..0..2
..0..0..1..1....1..1..2..1....1..2..3..2....1..3..1..3....0..3..3..2
..1..2..2..3....2..3..2..0....3..0..0..2....0..2..1..2....1..2..1..1
..0..3..0..0....1..1..2..3....1..1..1..1....3..2..3..0....3..2..0..3

Crossrefs

Sequence in context: A151600 A214804 A352330 * A223598 A223439 A223691

Adjacent sequences: A203818 A203819 A203820 * A203822 A203823 A203824

Keyword

nonn

Author

R. H. Hardin Jan 06 2012

Status

approved