determinar cuanto ahorrara en pesos una persona en 1 año, si ahorra 1 peso el primero de enero, 2 pesos el 2 de enero, 4 pesos el 3 de enero, 8 pesos el 4 de enero y así sucesivamente

int ahorro(int n, int cantidad=0){
  if(n==1) return cantidad;
  return ahorro(n-1,2*(n-1)+cantidad);
}

ahorro(365)

C++

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