|
|
A256960
|
|
a(0)=1, a(1)=4; thereafter a(n) = a(n-2)+2*A055099(n-1)+2^(n-1).
|
|
1
|
|
|
1, 4, 11, 36, 119, 408, 1419, 4988, 17631, 62528, 222163, 790180, 2812135, 10011304, 35647259, 126942540, 452078447, 1610033040, 5734081251, 20421960308, 72733344375, 259042555640, 922591559467, 3285854197276, 11702734525951, 41679889602784, 148445093121011, 528694969090116
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
FORMULA
|
G.f.: -(2*x+1)*(2*x^2+2*x-1) / ((x+1)*(2*x-1)*(2*x^2+3*x-1)). - Colin Barker, Jun 05 2015
|
|
PROG
|
(PARI) Vec(-(2*x+1)*(2*x^2+2*x-1)/((x+1)*(2*x-1)*(2*x^2+3*x-1)) + O(x^100)) \\ Colin Barker, Jun 06 2015
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|