|
| |
| |
|
|
|
1, 1, 2, 4, 8, 32, 64, 64, 128, 256, 512, 2048, 4096, 4096, 8192, 16384, 32768, 131072, 262144, 262144, 524288, 1048576, 2097152, 8388608, 16777216, 16777216, 33554432, 67108864, 134217728, 536870912, 1073741824
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,3
|
|
|
COMMENTS
|
A factor in A128056.
The signed sequence 1,1,2,-4,-8,-32,-64,-64,-128,256,512... is the Hankel transform of the doubled sequence 1,1,2,2,6,6,... of central binomial coefficients (A128014). [From Paul Barry, Sep 09 2008]
|
|
|
LINKS
|
Table of n, a(n) for n=0..30.
Index entries for linear recurrences with constant coefficients, signature (2,-4,8,-16,32).
|
|
|
FORMULA
|
G.f.:(-1-16*x^4+4*x^3-4*x^2+x)/((2*x-1)*(4*x^2-2*x+1)*(4*x^2+2*x+1)) [From Maksym Voznyy (voznyy(AT)mail.ru), Aug 11 2009]
|
|
|
CROSSREFS
|
Sequence in context: A151406 A307611 A053147 * A061285 A194810 A271216
Adjacent sequences: A128052 A128053 A128054 * A128056 A128057 A128058
|
|
|
KEYWORD
|
easy,nonn
|
|
|
AUTHOR
|
Paul Barry, Feb 13 2007
|
|
|
STATUS
|
approved
|
| |
|
|
