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A163305 Numerators of fractions in the approximation of the square root of 5 satisfying: a(n)= (a(n-1)+ c)/(a(n-1)+1); with c=5 and a(1)=0. Also product of the powers of two and five times the Fibonacci numbers. 0
0, 5, 10, 40, 120, 400, 1280, 4160, 13440, 43520, 140800, 455680, 1474560, 4771840, 15441920, 49971200, 161710080, 523304960, 1693450240, 5480120320, 17734041600, 57388564480, 185713295360, 600980848640, 1944814878720 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

For denominators see: A084057 (= product of Lucas numbers (excluding first number (2)), and powers of 2)

PROG

(PARI) a(n)=5*fibonacci(n-1)*2^(n-2) [From Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Aug 06 2009]

CROSSREFS

A000032, A000079, A084057, A000045

Sequence in context: A191580 A179306 A117865 * A001692 A038070 A136138

Adjacent sequences:  A163302 A163303 A163304 * A163306 A163307 A163308

KEYWORD

nonn

AUTHOR

Mark Dols (markdols99(AT)yahoo.com), Jul 24 2009

EXTENSIONS

More terms from Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Aug 06 2009

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Last modified February 16 08:13 EST 2012. Contains 205893 sequences.