OFFSET
0,2
COMMENTS
Floretion Algebra Multiplication Program, FAMP Code: famseq[.5'j + .5'k + .5j' + .5k' + .5'ii' + .5e]
FORMULA
a(n+1) - a(n) = A002249(n).
a(n) = 2*a(n-1)-3*a(n-2)+2*a(n-3). G.f.: (1+x+x^2)/((1-x)*(1-x+2*x^2)). [Colin Barker, Mar 27 2012]
MATHEMATICA
Table[(3 - ((1-I*Sqrt[7])^n + (1+I*Sqrt[7])^n)/2^n)/2 // Simplify, {n, 1, 50}] (* Jean-François Alcover, Jun 04 2017 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Creighton Dement, Apr 14 2005
EXTENSIONS
Corrected by T. D. Noe, Nov 07 2006
STATUS
approved