OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Tian-Xiao He and Renzo Sprugnoli, Sequence characterization of Riordan arrays, Discrete Math. 309 (2009), no. 12, 3962-3974.
Index entries for linear recurrences with constant coefficients, signature (-3,-3,-1).
FORMULA
a(n) = (-1)^(n+1)*A000096(n-1), n>1. - R. J. Mathar, Nov 28 2011
Sum_{n>=0} 1/a(n) = 37/18 - 4*log(2)/3. - Amiram Eldar, Jan 31 2023
MATHEMATICA
Join[{2, 1}, LinearRecurrence[{-3, -3, -1}, {-2, 5, -9}, 70]] (* Vladimir Joseph Stephan Orlovsky, Feb 22 2012 *)
CoefficientList[Series[1+x+(1+3*x+x^2)/(1+x)^3, {x, 0, 70}], x] (* Harvey P. Dale, Aug 01 2020 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, Nov 27 2011
STATUS
approved