OFFSET
0,2
COMMENTS
Hankel transform of A054109.
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (6,-11,6,-1).
FORMULA
G.f.: (1-2*x+6*x^2-x^3)/(1-3*x+x^2)^2.
a(n) = 6*a(n-1) - 11*a(n-2) + 6*a(n-3) - a(n-4). - Wesley Ivan Hurt, Jul 28 2022
MATHEMATICA
LinearRecurrence[{6, -11, 6, -1}, {1, 4, 19, 75}, 100] (* G. C. Greubel, Jun 13 2016 *)
CoefficientList[Series[(1-2x+6x^2-x^3)/(1-3x+x^2)^2, {x, 0, 30}], x] (* Harvey P. Dale, Aug 04 2018 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Nov 04 2009
STATUS
approved