login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A131041 a(n) = 2*a(n-1) - a(n-2) - a(n-4). 3
1, 1, 1, -1, -4, -8, -13, -17, -17, -9, 12, 50, 105, 169, 221, 223, 120, -152, -645, -1361, -2197, -2881, -2920, -1598, 1921, 8321, 17641, 28559, 37556, 38232, 21267, -24257, -107337, -228649, -371228, -489550, -500535, -282871, 306021 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Generating floretion is .5i' + .5j' + .5k' + .5e + 'ii' (for A131039 it is 'i + .5i' + .5j' + .5k' + .5e and for A131040 it is 1.5i' + .5j' + .5k' + .5e)

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (2, -1, 0, -1).

FORMULA

G.f. (1-x-2*x^3)/(1-2*x+x^2+x^4)

MAPLE

Floretion Algebra Multiplication Program, FAMP Code: 2tesseq[.5i' + .5j' + .5k' + .5e + 'ii']

MATHEMATICA

LinearRecurrence[{2, -1, 0, -1}, {1, 1, 1, -1}, 40] (* Harvey P. Dale, Oct 14 2012 *)

CROSSREFS

Cf. A131039, A131040, A131042, A002316, A002531.

Sequence in context: A032474 A222304 A103024 * A081843 A004938 A172325

Adjacent sequences:  A131038 A131039 A131040 * A131042 A131043 A131044

KEYWORD

easy,sign

AUTHOR

Creighton Dement, Jun 11 2007

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified November 21 05:01 EST 2017. Contains 294988 sequences.