|
Search: id:A108207
|
|
|
| A108207 |
|
a(n)= 5*(n-1)*a(n-1) -(n-1)*a(n-2), with a(0)=0, a(1)=1. |
|
+0
1
|
|
| 0, 1, 5, 48, 705, 13908, 344175, 10241802, 356053845, 14160219384, 634005387675, 31558667189910, 1728752636180625, 103346454164558580, 6695045736425959575, 467206351191513350130, 34940050653317111866125
(list; graph; listen)
|
|
|
OFFSET
|
0,3
|
|
|
COMMENT
|
This is also the (2,2) element of the product matrix after multiplying the unit matrix from the
left by the matrices (0,-1;j-1,5j-5) in the order j=2 to n.
|
|
MATHEMATICA
|
M[n_] := {{0, -1}, {(n - 1), 5*(n - 1)}} v[1] = {0, 1} v[n_] := v[n] = M[n].v[n - 1] a = Table[Abs[v[n][[1]]], {n, 1, 25}]
|
|
CROSSREFS
|
Cf. A000166.
Sequence in context: A048435 A023999 A126224 this_sequence A127091 A063429 A007406
Adjacent sequences: A108204 A108205 A108206 this_sequence A108208 A108209 A108210
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Jun 15 2005
|
|
EXTENSIONS
|
Definition replaced by recurrence by the Associate Editors of the OEIS, Sep 28 2009
|
|
|
Search completed in 0.002 seconds
|
