OFFSET
0,4
LINKS
Index entries for linear recurrences with constant coefficients, signature (7,-9,-12).
FORMULA
G.f.: x^2 / ( (4*x-1)*(3*x^2+3*x-1) ).
a(n) = 4^n - A125145(n).
MATHEMATICA
LinearRecurrence[{7, -9, -12}, {0, 0, 1}, 30] (* Harvey P. Dale, Feb 27 2023 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. J. Mathar, Feb 13 2022
STATUS
approved