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Search: id:A111570
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| A111570 |
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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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| 2, 5, 4, 7, 14, 23, 34, 55, 92, 149, 238, 385, 626, 1013, 1636, 2647, 4286, 6935, 11218, 18151, 29372, 47525, 76894, 124417, 201314, 325733, 527044, 852775, 1379822, 2232599, 3612418, 5845015, 9457436, 15302453, 24759886
(list; graph; listen)
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OFFSET
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0,1
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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. (-2-3*x+x^2-x^3)/((1+x^2)*(x^2+x-1))
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PROGRAM
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Floretion Algebra Multiplication Program, FAMP Code: 1vesseq[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, A111571, A111572, A111573, A007598, A000045.
Adjacent sequences: A111567 A111568 A111569 this_sequence A111571 A111572 A111573
Sequence in context: A036237 A015948 A119733 this_sequence A057954 A155896 A060710
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KEYWORD
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easy,nonn
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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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