The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A279872 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A279872

Decimal representation of the x-axis, from the left edge to the origin, (and also from the origin to the right edge) of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 209", based on the 5-celled von Neumann neighborhood.
(history; published version)

#19 by Alois P. Heinz at Mon Aug 02 02:39:04 EDT 2021

STATUS

reviewed

approved

#18 by Joerg Arndt at Mon Aug 02 02:32:01 EDT 2021

STATUS

proposed

reviewed

#17 by Chai Wah Wu at Mon Aug 02 02:16:57 EDT 2021

STATUS

editing

proposed

#16 by Chai Wah Wu at Mon Aug 02 02:16:35 EDT 2021

LINKS

<a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,5,0,-4).

FORMULA

From _Conjectures from _Chai Wah Wu_, Aug 02 2021: (Start)

STATUS

proposed

editing

#15 by Chai Wah Wu at Mon Aug 02 02:13:43 EDT 2021

STATUS

editing

proposed

#14 by Chai Wah Wu at Mon Aug 02 02:13:38 EDT 2021

LINKS

<a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (0,5,0,-4).

FORMULA

From Chai Wah Wu, Aug 02 2021: (Start)

a(n) = 5*a(n-2) - 4*a(n-4) for n > 3.

G.f.: (2*x^2 + 1)/(4*x^4 - 5*x^2 + 1). (End)

STATUS

approved

editing

#13 by Jon E. Schoenfield at Sun Mar 12 15:43:49 EDT 2017

STATUS

editing

approved

#12 by Jon E. Schoenfield at Sun Mar 12 15:43:45 EDT 2017

COMMENTS

The non-zero nonzero bisection appears to be A083420. - Tom Copeland, Dec 27 2016

STATUS

approved

editing

#11 by N. J. A. Sloane at Tue Dec 27 23:16:40 EST 2016

STATUS

editing

approved

#10 by N. J. A. Sloane at Tue Dec 27 23:15:41 EST 2016

COMMENTS

DeThe non-aerated, this zero bisection appears to be A083420. - Tom Copeland, Dec 27 2016

CROSSREFS

Cf. A279118, A083420.

STATUS

proposed

editing

Discussion

Tue Dec 27

23:16

N. J. A. Sloane: I suggest The non-zero bisection appears to be A083420. as a simpler and clearer comment (which is certainly warranted)