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 A111570 a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4. 5

%I

%S 2,5,4,7,14,23,34,55,92,149,238,385,626,1013,1636,2647,4286,6935,

%T 11218,18151,29372,47525,76894,124417,201314,325733,527044,852775,

%U 1379822,2232599,3612418,5845015,9457436,15302453,24759886

%N a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4.

%C See comment and FAMP code for A111569.

%F G.f. (-2-3*x+x^2-x^3)/((1+x^2)*(x^2+x-1))

%o 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

%Y Cf. A001638, A111569, A111571, A111572, A111573, A007598, A000045.

%K easy,nonn

%O 0,1

%A _Creighton Dement_, Aug 10 2005

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Last modified May 21 08:51 EDT 2019. Contains 323441 sequences. (Running on oeis4.)