OFFSET
0,4
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (6,-12,8).
FORMULA
G.f.: -x^2*(4*x^3-4*x^2+1)/(2*x-1)^3.
MATHEMATICA
LinearRecurrence[{6, -12, 8}, {0, 0, 1, 6, 20, 60}, 40] (* Harvey P. Dale, Aug 27 2021 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Jul 21 2019
STATUS
approved