|
| |
|
|
A085695
|
|
a(n) = F(n) F(3n) / 2, where F(n) = Fibonacci number (A000045).
|
|
0
| |
|
|
0, 1, 4, 34, 216, 1525, 10336, 71149, 486864, 3339106, 22881100, 156843721, 1074985344, 7368157369, 50501844796, 346145466850, 2372514562656, 16261461342589, 111457702083424, 763942486626661, 5236139616899400
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,3
|
|
|
FORMULA
| G.f.: ( x - x^3 )/( 1 - 4 x - 19 x^2 - 4 x^3 + x^4 ) Recurrence: a(n+4) = 4 a(n+3) + 19 a(n+2) + 4 a(n+1) - a(n)
|
|
|
PROG
| (Mupad) numlib::fibonacci(3*n)*numlib::fibonacci(n)/2 $ n = 0..35; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 13 2008
|
|
|
CROSSREFS
| Sequence in context: A129557 A196908 A197075 * A049293 A198687 A116430
Adjacent sequences: A085692 A085693 A085694 * A085696 A085697 A085698
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Emanuele Munarini (munarini(AT)mate.polimi.it), Jul 18 2003
|
| |
|
|
