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

 

Logo

Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A103646 G.f. 9*(3x+1)/(1+2x-6x^2-27x^3). 0
9, 9, 36, 225, 9, 2304, 1521, 11025, 49284, 8649, 576081, 230400, 3229209, 10478169, 4639716, 140778225, 29192409, 911556864, 2153052801, 1951430625, 33627490884, 2586027609, 249281516961, 424895385600, 715721076009, 7848531119529 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

A floretion-generated sequence of squares. This sequence is related to several other sequences of squares.

LINKS

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

Index to sequences with linear recurrences with constant coefficients, signature (-2,6,27).

FORMULA

a(n+3) = -2a(n+2) + 6a(n+1) + 27a(n), a(0) = 9, a(1) = 9, a(2) = 36

a(n) = 9*A103644(n).

4*3^(n+1) = 2*A103644(n) + a(n) + A103645(n) = 11*A103644(n) + A103645(n).

MATHEMATICA

CoefficientList[ Series[9(3x + 1)/(1 + 2x - 6x^2 - 27x^3), {x, 0, 25}], x] (from Robert G. Wilson v Feb 12 2005)

PROG

Floretion Algebra Multiplication Program, FAMP Code: 4ibaseiseq[ x*(+ 'i + 'j + i' + j' + 'ii' + 'jj' + 'ij' + 'ji' + e) ] where x is the sum of all (16) floretion basis vectors.

CROSSREFS

Cf. A103644, A103645.

Sequence in context: A145954 A003874 A097988 * A246314 A111219 A242585

Adjacent sequences:  A103643 A103644 A103645 * A103647 A103648 A103649

KEYWORD

easy,nonn,changed

AUTHOR

Creighton Dement, Feb 12 2005

EXTENSIONS

Corrected and extended by Robert G. Wilson v, Feb 12 2005

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified October 1 06:15 EDT 2014. Contains 247503 sequences.