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A203831 Number of (n+1)X5 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements 1
5625, 151659, 4238721, 119606211, 3383285769, 95763046491, 2710984443345, 76749227497395, 2172829037910489, 61514609224652235, 1741531281545538081, 49304251065416837283, 1395845890054082693289, 39517602012270762571323 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A203835

LINKS

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

FORMULA

Empirical: a(n) = 31*a(n-1) -24*a(n-2) -1612*a(n-3) +3816*a(n-4) +1152*a(n-5) -2784*a(n-6) +256*a(n-7)

EXAMPLE

Some solutions for n=4

..2..1..2..1..0....2..0..2..2..0....1..0..1..2..0....0..0..0..1..2

..1..2..1..2..1....1..2..1..2..2....1..1..2..0..2....1..0..2..0..1

..1..1..1..1..2....2..1..0..1..2....2..1..1..2..2....2..1..0..0..0

..2..1..2..1..1....1..1..1..1..1....2..2..1..1..2....2..2..1..0..0

..2..2..2..2..1....2..1..1..1..0....2..1..0..1..1....1..2..2..1..0

CROSSREFS

Sequence in context: A058003 A202098 A247261 * A014799 A031573 A031753

Adjacent sequences:  A203828 A203829 A203830 * A203832 A203833 A203834

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2012

STATUS

approved

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Last modified July 11 23:26 EDT 2020. Contains 335652 sequences. (Running on oeis4.)