OFFSET
1,1
LINKS
Index entries for linear recurrences with constant coefficients, signature (9, -27, 27).
FORMULA
O.g.f.: z*3^1*(2-3*z)/(1-3*z)^3.
a(n) = A287768(n+3,4).
MATHEMATICA
Table[(1/2!)*3^n*(n + 3) n, {n, 24}] (* Michael De Vlieger, Jun 23 2017 *)
LinearRecurrence[{9, -27, 27}, {6, 45, 243}, 30] (* Harvey P. Dale, Apr 04 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Gregory Gerard Wojnar, Jun 17 2017
STATUS
approved