|
|
A026381
|
|
T(n,n-2), where T is the array in A026374.
|
|
2
|
|
|
1, 4, 11, 17, 30, 39, 58, 70, 95, 110, 141, 159, 196, 217, 260, 284, 333, 360, 415, 445, 506, 539, 606, 642, 715, 754, 833, 875, 960, 1005, 1096, 1144, 1241, 1292, 1395, 1449, 1558, 1615, 1730, 1790, 1911, 1974, 2101, 2167, 2300
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
2,2
|
|
LINKS
|
|
|
FORMULA
|
G.f.: z^2*(1+3z+5z^2)/[(1-z)^3*(1+z)^2]. - Emeric Deutsch, Jan 25 2004
|
|
MATHEMATICA
|
Drop[CoefficientList[Series[z^2(1+3z+5z^2)/((1-z)^3(1+z)^2), {z, 0, 50}], z], 2] (* or *) LinearRecurrence[{1, 2, -2, -1, 1}, {1, 4, 11, 17, 30}, 50] (* Harvey P. Dale, Dec 31 2021 *)
|
|
PROG
|
(Haskell)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|