|
| |
|
|
A111572
|
|
a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4.
|
|
5
| |
|
|
-1, 3, 2, 1, 3, 8, 11, 15, 26, 45, 71, 112, 183, 299, 482, 777, 1259, 2040, 3299, 5335, 8634, 13973, 22607, 36576, 59183, 95763, 154946, 250705, 405651, 656360, 1062011, 1718367, 2780378, 4498749, 7279127, 11777872, 19056999, 30834875, 49891874, 80726745
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,2
|
|
|
COMMENTS
| See comment and FAMP code for A111569.
|
|
|
FORMULA
| G.f. (1-4*x+x^2)/((1+x^2)*(x^2+x-1))
|
|
|
PROG
| Floretion Algebra Multiplication Program, FAMP Code: 4ibaseseq[B+H] with B = - .25'i + .25'j - .25i' + .25j' + k' - .5'kk' - .25'ik' - .25'jk' - .25'ki' - .25'kj' - .5e and H = + .75'ii' + .75'jj' + .75'kk' + .75e
|
|
|
CROSSREFS
| Cf. A001638, A111569, A111570, A111571, A111573, A111574, A111575, A111576.
Sequence in context: A124782 A106611 A025261 * A046900 A194528 A194520
Adjacent sequences: A111569 A111570 A111571 * A111573 A111574 A111575
|
|
|
KEYWORD
| easy,sign
|
|
|
AUTHOR
| Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Aug 10 2005
|
| |
|
|
