|
| |
|
|
A144465
|
|
Sequence of powers: a(n)=If [n == 0, 1, 5^n - 2^(n - 1)].
|
|
0
| |
|
|
1, 4, 23, 121, 617, 3109, 15593, 78061, 390497, 1952869, 9765113, 48827101, 244138577, 1220699029, 6103507433, 30517561741, 152587857857, 762939387589, 3814697134553, 19073486065981, 9536743111633
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
FORMULA
| a(n)=If [n == 0, 1, 5^n - 2^(n - 1)].
a(n)= 7*a(n-1)-10*a(n-2), n>3. G.f.: x(1-3x+5x^2)/((1-5x)(1-3x)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 08 2008]
|
|
|
MATHEMATICA
| Table[If [n == 0, 1, 5^n - 2^(n - 1)], {n, 0, 20}]
|
|
|
CROSSREFS
| Sequence in context: A174248 A201350 A015532 * A024050 A193808 A038723
Adjacent sequences: A144462 A144463 A144464 * A144466 A144467 A144468
|
|
|
KEYWORD
| nonn,uned
|
|
|
AUTHOR
| Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Oct 09 2008
|
| |
|
|
