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A195563 Numerators b(n) of Pythagorean approximations b(n)/a(n) to 1/4. 3
0, 7, 9, 16, 399, 657, 1040, 26391, 43289, 68640, 1741343, 2856481, 4529184, 114902311, 188484393, 298857520, 7581811119, 12437113521, 19720067120, 500284631607, 820661007929, 1301225572416, 33011203874879, 54151189409857 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A195500 for discussion and list of related sequences; see A195562 for Mathematica program.

LINKS

Table of n, a(n) for n=1..24.

FORMULA

Empirical g.f.: -x^2*(x^7-x^6-72*x^4+56*x^3-16*x^2-9*x-7) / (x^9-65*x^6-65*x^3+1). - Colin Barker, Jun 04 2015

CROSSREFS

Cf. A195500, A195562, A195564.

Sequence in context: A249333 A020691 A145830 * A250292 A140364 A022321

Adjacent sequences:  A195560 A195561 A195562 * A195564 A195565 A195566

KEYWORD

nonn

AUTHOR

Clark Kimberling, Sep 21 2011

STATUS

approved

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Last modified October 7 14:13 EDT 2022. Contains 357271 sequences. (Running on oeis4.)