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A203880 Number of (n+1)X2 0..6 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements 1
637, 8281, 107653, 1399489, 18193357, 236513641, 3074677333, 39970805329, 519620469277, 6755066100601, 87815859307813, 1141606171001569, 14840880223020397, 192931442899265161, 2508108757690447093 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A203887
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 07 2012
STATUS
approved

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Last modified June 25 13:13 EDT 2024. Contains 373705 sequences. (Running on oeis4.)