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A175395 2*Fibonacci(n)^2. 5
0, 2, 2, 8, 18, 50, 128, 338, 882, 2312, 6050, 15842, 41472, 108578, 284258, 744200, 1948338, 5100818, 13354112, 34961522, 91530450, 239629832, 627359042, 1642447298, 4299982848, 11257501250, 29472520898, 77160061448, 202007663442, 528862928882, 1384581123200, 3624880440722, 9490060198962, 24845300156168, 65045840269538, 170292220652450, 445830821687808, 1167200244410978, 3055769911545122, 8000109490224392, 20944558559128050 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) (n=1..) is half the number of nX2 binary arrays with no element equal to a strict majority of its diagonal and antidiagonal neighbors. - R. H. Hardin, Dec 02 2010.

a(n) = 2*A007598(n).

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

G.f.: 2*x*(1-x)/(1+x)/(1-3*x+x^2). [Colin Barker, Feb 23 2012]

PROG

(MAGMA) [2*Fibonacci(n)^2: n in [0..50]]; // Vincenzo Librandi, Apr 24 2011

CROSSREFS

Cf. A000045, A007598.

Sequence in context: A009725 A053098 A194588 * A169888 A168506 A208966

Adjacent sequences:  A175392 A175393 A175394 * A175396 A175397 A175398

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 03 2010

STATUS

approved

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Last modified October 25 06:26 EDT 2014. Contains 248518 sequences.