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Search: id:A086213
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| A086213 |
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Tribonacci numbers that start with first three cubes. |
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+0
2
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| 1, 8, 27, 36, 71, 134, 241, 446, 821, 1508, 2775, 5104, 9387, 17266, 31757, 58410, 107433, 197600, 363443, 668476, 1229519, 2261438, 4159433, 7650390, 14071261, 25881084, 47602735, 87555080, 161038899, 296196714, 544790693, 1002026306
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n) = a(n-1) + a(n-2) + a(n-3).
G.f.=(1+7x+18x^2)/(1-x-x^2-x^3).
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MAPLE
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a[0] := 1: a[1] := 8: a[2] := 27: for n from 3 to 40 do a[n] := a[n-1]+a[n-2]+a[n-3] od: seq(a[n], n=0..40);
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CROSSREFS
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Cf. A000213, A086192.
Sequence in context: A056824 A051760 A066215 this_sequence A131548 A063142 A144619
Adjacent sequences: A086210 A086211 A086212 this_sequence A086214 A086215 A086216
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KEYWORD
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nonn,easy
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AUTHOR
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Jun Mizuki (suzuki32(AT)sanken.osaka-u.ac.jp), Aug 28 2003
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EXTENSIONS
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Edited by Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 09 2004
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