A203880 Number of (n+1)X2 0..6 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements

637, 8281, 107653, 1399489, 18193357, 236513641, 3074677333, 39970805329, 519620469277, 6755066100601, 87815859307813, 1141606171001569, 14840880223020397, 192931442899265161, 2508108757690447093

Offset

1,1

Comments

Column 1 of A203887

Links

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

Formula

Empirical: a(n) = 49*13^n

Example

Some solutions for n=4
..5..3....1..0....4..1....0..5....1..3....1..4....2..5....4..5....6..0....2..1
..0..5....1..1....5..4....2..0....6..1....3..1....1..2....3..4....3..6....1..2
..6..0....0..1....2..5....0..1....4..6....0..3....1..1....4..4....3..3....0..1
..5..6....3..0....2..2....2..0....2..4....5..0....2..1....1..4....4..3....3..0
..5..5....1..3....4..2....6..2....1..2....3..5....0..2....0..1....1..4....0..5

Crossrefs

Sequence in context: A043483 A203042 A203887 * A250465 A203879 A317395

Adjacent sequences: A203877 A203878 A203879 * A203881 A203882 A203883

Keyword

nonn

Author

R. H. Hardin Jan 07 2012

Status

approved