|
Search: id:A086213
|
|
|
| A086213 |
|
Tribonacci numbers that start with first three cubes. |
|
+0
2
|
|
| 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)
|
|
|
OFFSET
|
0,2
|
|
|
FORMULA
|
a(n) = a(n-1) + a(n-2) + a(n-3).
G.f.=(1+7x+18x^2)/(1-x-x^2-x^3).
|
|
MAPLE
|
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);
|
|
CROSSREFS
|
Cf. A000213, A086192.
Sequence in context: A056824 A051760 A066215 this_sequence A131548 A063142 A032553
Adjacent sequences: A086210 A086211 A086212 this_sequence A086214 A086215 A086216
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Jun Mizuki (suzuki32(AT)sanken.osaka-u.ac.jp), Aug 28 2003
|
|
EXTENSIONS
|
Edited by Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 09 2004
|
|
|
Search completed in 0.002 seconds
|
