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A203927 Number of (n+1)X2 0..5 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements 1
396, 4356, 47916, 527076, 5797836, 63776196, 701538156, 7716919716, 84886116876, 933747285636, 10271220141996, 112983421561956, 1242817637181516, 13670994008996676, 150380934098963436, 1654190275088597796 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A203934

LINKS

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

FORMULA

Empirical: a(n) = 36*11^n

EXAMPLE

Some solutions for n=4

..1..1....3..0....0..4....2..4....1..1....0..5....3..5....5..4....5..4....5..4

..3..1....5..3....5..0....3..2....5..1....5..0....3..3....5..5....3..5....0..5

..5..3....5..5....4..5....4..3....0..5....0..4....5..3....4..5....1..3....4..0

..3..5....1..5....5..3....1..4....5..2....3..0....4..5....0..4....1..1....5..4

..0..3....3..1....3..4....5..1....2..1....4..3....0..4....5..0....4..1....1..5

CROSSREFS

Sequence in context: A028299 A205628 A203934 * A205330 A092720 A230732

Adjacent sequences:  A203924 A203925 A203926 * A203928 A203929 A203930

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 2012

STATUS

approved

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Last modified October 6 12:35 EDT 2022. Contains 357264 sequences. (Running on oeis4.)