|
|
A030110
|
|
a(n) = 2^n - n^2 + 1.
|
|
2
|
|
|
2, 2, 1, 0, 1, 8, 29, 80, 193, 432, 925, 1928, 3953, 8024, 16189, 32544, 65281, 130784, 261821, 523928, 1048177, 2096712, 4193821, 8388080, 16776641, 33553808, 67108189, 134217000, 268434673, 536870072, 1073740925, 2147482688
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,1
|
|
LINKS
|
|
|
FORMULA
|
G.f.: (2-8*x+9*x^2-x^3)/((1-2*x)*(1-x)^3).
a(n) = 5*a(n-1) - 9*a(n-2) + 7*a(n-3) - 2*a(n-4). - Matthew House, Jan 15 2017
|
|
MAPLE
|
|
|
MATHEMATICA
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Steve Gray (stevebg(AT)roadrunner.com)
|
|
STATUS
|
approved
|
|
|
|