code: def test_RecursiveSeq():
      y = Function("y")
      n = Symbol("n")
      fib = RecursiveSeq(y(n - 1) + y(n - 2), y(n), n, [0, 1])
      assert fib.coeff(3) == 2
  
imports: from sympy.core.containers import Tuple
  from sympy.core.function import Function
  from sympy.core.numbers import oo, Rational
  from sympy.core.singleton import S
  from sympy.core.symbol import symbols, Symbol
  from sympy.functions.combinatorial.numbers import tribonacci, fibonacci
  from sympy.functions.elementary.exponential import exp
  from sympy.functions.elementary.miscellaneous import sqrt
  from sympy.functions.elementary.trigonometric import cos, sin
  from sympy.series import EmptySequence
  from sympy.series.sequences import SeqMul, SeqAdd, SeqPer, SeqFormula, sequence
  from sympy.sets.sets import Interval
  from sympy.tensor.indexed import Indexed, Idx
  from sympy.series.sequences import SeqExpr, SeqExprOp, RecursiveSeq
  from sympy.testing.pytest import raises, slow
label_desc: Use image node_id 16 for calling a global function with example usage: test_RecursiveSeq() without return types