login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A068718 Boustrophedon transform of A068717 with A068717(1) = -1 instead of 0. 1
1, 2, 2, 2, 8, 25, 90, 404, 2055, 11792, 75053, 525622, 4015361, 33231679, 296182315, 2828335731, 28809181418, 311788442591, 3572832236720, 43216177809190, 550245463265240, 7356239983352887, 103028812072639378 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Signs omitted, all terms < 0. A068717(1) = -1 means soluble (1*1 -1*0*0 = +1 resp. 0*0 -1*1*1 = -1).

LINKS

Table of n, a(n) for n=0..22.

CROSSREFS

Cf. A068716, A068717, A049240, A046951.

Sequence in context: A220177 A220805 A298647 * A075097 A138056 A340080

Adjacent sequences:  A068715 A068716 A068717 * A068719 A068720 A068721

KEYWORD

nonn,easy

AUTHOR

Frank Ellermann, Feb 26 2002

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 19 21:11 EDT 2021. Contains 347564 sequences. (Running on oeis4.)