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A067649 Numerators of power series for sqrt(1+x^2)/sqrt(1-x). 0
1, 1, 7, 9, 43, 87, 387, 665, 8499, 17003, 72345, 131903, 913919, 1825875, 7629371, 14275257, 410980675, 820899123, 3396389533, 6448133283, 47448015653, 94775447369, 389689995525, 746772134927, 11150225818167, 22273876637759 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..25.

CROSSREFS

Denominators are given in A046161(n)

Sequence in context: A323676 A007449 A189053 * A025631 A258183 A038275

Adjacent sequences:  A067646 A067647 A067648 * A067650 A067651 A067652

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Feb 02 2002

STATUS

approved

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Last modified June 25 05:41 EDT 2019. Contains 324346 sequences. (Running on oeis4.)