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A106666
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G.f. (1-4*x^2+2*x^3)/((1-x)*(2*x^3-2*x^2-2*x+1)).
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0
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1, 3, 5, 13, 29, 73, 177, 441, 1089, 2705, 6705, 16641, 41281, 102433, 254145, 630593, 1564609, 3882113, 9632257, 23899521, 59299329, 147133185, 365065985, 905799681, 2247464961, 5576397313, 13836125185, 34330115073, 85179685889
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..28.
Index entries for linear recurrences with constant coefficients, signature (3,0,-4,2)
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FORMULA
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Superseeker results: a(n+1) - a(n) = A052970(n+2); a(n+2) - a(n) = A052987(n+2).
a(0)=1, a(n) = 2*A077937(n-1) + 1.
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MATHEMATICA
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LinearRecurrence[{3, 0, -4, 2}, {1, 3, 5, 13}, 30] (* Harvey P. Dale, Jul 28 2015 *)
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PROG
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Floretion Algebra Multiplication Program, FAMP Code: 1vesseq[I*J*cyc(I)] with I = + .5'ii' + .5'kk' + .5'ik' + .5'jk' + .5'ki' + .5'kj' and J = + .5'i + .5i' - .5'ii' + .5'jj' + .5'kk' + .5e
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CROSSREFS
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Cf. A052970, A052987.
Sequence in context: A238216 A067932 A168314 * A124791 A147046 A233232
Adjacent sequences: A106663 A106664 A106665 * A106667 A106668 A106669
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KEYWORD
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easy,nonn
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AUTHOR
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Creighton Dement, May 13 2005
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STATUS
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approved
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