|
| |
|
|
A140824
|
|
G.f.: (x-x^3)/(1-3*x+2*x^2-3*x^3+x^4).
|
|
0
| |
|
|
0, 1, 3, 6, 15, 41, 108, 281, 735, 1926, 5043, 13201, 34560, 90481, 236883, 620166, 1623615, 4250681, 11128428, 29134601, 76275375, 199691526, 522799203, 1368706081, 3583319040, 9381251041, 24560434083, 64300051206, 168339719535, 440719107401, 1153817602668
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,3
|
|
|
COMMENTS
| A divisibilty sequence.
|
|
|
FORMULA
| a(0) = 0, a(1) = 1, a(2) = 3, a(3) = 6, a(n) - 3 a(n + 1) + 2 a(n + 2) - 3 a(n + 3) + a(n + 4) = 0.
|
|
|
CROSSREFS
| Sequence in context: A086326 A098701 A152799 * A001433 A005368 A067771
Adjacent sequences: A140821 A140822 A140823 * A140825 A140826 A140827
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Sep 07 2009, based on email from R. K. Guy, Mar 09 2009
|
| |
|
|
