OFFSET
0,2
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
J. Goldwasser et al., The density of ones in Pascal's rhombus, Discrete Math., 204 (1999), 231-236.
Paul K. Stockmeyer, The Pascal Rhombus and the Stealth Configuration, arXiv:1504.04404 [math.CO], 2015.
Index entries for linear recurrences with constant coefficients, signature (4,1,-8,-4).
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
N. J. A. Sloane, Apr 14 2015
STATUS
approved