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Search: id:A111572
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| A111572 |
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a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4. |
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+0
6
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| -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; listen)
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OFFSET
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0,2
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COMMENT
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See comment and FAMP code for A111569.
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FORMULA
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G.f. (1-4*x+x^2)/((1+x^2)*(x^2+x-1))
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PROGRAM
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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
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CROSSREFS
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Cf. A001638, A111569, A111570, A111571, A111573, A111574, A111575, A111576.
Sequence in context: A124782 A106611 A025261 this_sequence A046900 A082727 A112603
Adjacent sequences: A111569 A111570 A111571 this_sequence A111573 A111574 A111575
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KEYWORD
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easy,sign
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AUTHOR
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Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Aug 10 2005
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