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Search: id:A104187
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| A104187 |
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G.f. (1+x^2+x^4)/((x^3+x^2+x-1)(x-1)^2). |
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+0
2
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| 1, 3, 8, 18, 38, 76, 147, 279, 523, 973, 1802, 3328, 6136, 11302, 20805, 38285, 70437, 129575, 238348, 438414, 806394, 1483216, 2728087, 5017763, 9229135, 16975057, 31222030
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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A floretion-generated sequence involving Tribonacci numbers.
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FORMULA
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a(n+2) - 2*a(n+1) + a(n) = A081172(n+4)
a(n) = (1/2) [A000073(n+3) + A000073(n+6) - 3n - 6 ]. - Ralf Stephan, May 20 2007
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PROGRAM
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Floretion Algebra Multiplication Program, FAMP Code: 1tesforrokseq[A*B] = A = - .5'ii' + .5'jj' + .5'kk' + .5e B = + 'kj', 1vesforrokseq[A*B] = A000004, ForType: 1A.
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CROSSREFS
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Cf. A081172.
Adjacent sequences: A104184 A104185 A104186 this_sequence A104188 A104189 A104190
Sequence in context: A036642 A000235 A006478 this_sequence A051633 A131051 A117727
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KEYWORD
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nonn
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AUTHOR
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Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Apr 01 2005
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