|
| |
|
|
A118442
|
|
Column 0 of triangle A118441, which is the matrix log of triangle A118435.
|
|
4
|
|
|
|
0, 1, -4, -12, 32, 80, -192, -448, 1024, 2304, -5120, -11264, 24576, 53248, -114688, -245760, 524288, 1114112, -2359296, -4980736, 10485760, 22020096, -46137344, -96468992, 201326592, 419430400, -872415232, -1811939328, 3758096384, 7784628224, -16106127360, -33285996544
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,3
|
|
|
COMMENTS
|
A signed version of A001787(n) = n*2^(n-1).
|
|
|
LINKS
|
Table of n, a(n) for n=0..31.
Index to sequences with linear recurrences with constant coefficients, signature (0,-8,0,-16).
|
|
|
FORMULA
|
G.f.: x*(1 - 4*x - 4*x^2)/(1 + 4*x^2)^2.
|
|
|
PROG
|
(PARI) {a(n)=polcoeff(x*(1 - 4*x - 4*x^2)/(1 + 4*x^2 +x*O(x^n))^2, n)}
|
|
|
CROSSREFS
|
Cf. A118441 (triangle), A118443 (row sums); A118435, A001787.
Sequence in context: A139756 A001787 A085750 * A038592 A048776 A135248
Adjacent sequences: A118439 A118440 A118441 * A118443 A118444 A118445
|
|
|
KEYWORD
|
sign
|
|
|
AUTHOR
|
Paul D. Hanna, Apr 28 2006
|
|
|
STATUS
|
approved
|
| |
|
|
