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A163271 Numerators of fractions in a 'zero-transform'-approximation of square root 2 by means of: a(n)= (a(n-1)+ c)/(a(n-1)+1); with c=2 and a(1)=0 1
0, 2, 4, 10, 24, 58, 140, 338, 816, 1970, 4756, 11482, 27720, 66922, 161564, 390050, 941664, 2273378, 5488420 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

Twice the Pell numbers; for denominators see: A001333 (numerators of the approximation of square root 2 for a(1) = 1)

CROSSREFS

A000129(Pell numbers), A001333(denominators), A052542, A08336('zero-transform' nummerators of square root 3, zero is missing).

Sequence in context: A024740 A025275 A165409 * A052542 A178036 A191625

Adjacent sequences:  A163268 A163269 A163270 * A163272 A163273 A163274

KEYWORD

nonn

AUTHOR

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

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Last modified February 16 23:45 EST 2012. Contains 205978 sequences.