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A054454 Third column of triangle A054453. 4
1, 2, 6, 12, 26, 50, 97, 180, 332, 600, 1076, 1908, 3361, 5878, 10226, 17700, 30510, 52390, 89665, 153000, 260376, 442032, 748776, 1265832, 2136001, 3598250, 6052062, 10164540, 17048642 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

a(n)= A054453(n+2, 2). a(2*k)= 1+(8*n*F(2*n+1)+3*(2*n+1)*F(2*n))/5, a(2*k+1)=2*(2*(2*n+1)*F(2*(n+1))+3*(n+1)*F(2*n+1))/5.

G.f.: ((Fib(x))^2)/(1-x^2), with Fib(x)=1/(1-x-x^2) = g.f. A000045(n+1)(Fibonacci numbers without F(0)).

CROSSREFS

Cf. A054453, A000045.

Sequence in context: A034875 A136515 A141347 * A084170 A052971 A029863

Adjacent sequences:  A054451 A054452 A054453 * A054455 A054456 A054457

KEYWORD

easy,nonn

AUTHOR

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Apr 27 2000

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Last modified February 15 05:45 EST 2012. Contains 205694 sequences.