OFFSET
1,2
LINKS
Indranil Ghosh, Table of n, a(n) for n = 1..3402
Index entries for linear recurrences with constant coefficients, signature (2, 0, 0, 0, 0, -1).
FORMULA
a(1)=1, a(2)=2, a(3)=3, a(4)=4, a(5)=5, a(6)=10, a(n)=2*a(n-1)-a(n-6) [From Harvey P. Dale, May 23 2011]
G.f. x*( 1-x^2-2*x^3-3*x^4 ) / ( (x-1)*(x^5+x^4+x^3+x^2+x-1) ). - R. J. Mathar, May 26 2011
MATHEMATICA
Accumulate[LinearRecurrence[{1, 1, 1, 1, 1}, {1, 1, 1, 1, 1}, 50]] (* or *) LinearRecurrence[{2, 0, 0, 0, 0, -1}, {1, 2, 3, 4, 5, 10}, 50](* Harvey P. Dale, May 23 2011 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Harvey P. Dale, May 23 2011
STATUS
approved