PANE - secuencias en leds

int pinArray [] = {2,3,4,5,6,7,8,9,10,11,12,13 };    // Vector donde se van a declarar los LEDs
int waitStart= 200;  // Tiempo entre encender un LED y otro
int tailLength = 4;     // Numero de LEDs activos
int lineSize = 12;       // Numero total de LEDs

void setup()
  {
    int i;
    for (i=0; i< lineSize; i++)
    {
      pinMode(pinArray[i], OUTPUT);
    } 
  }

void loop()
  {
    int i;
    int tailCounter = tailLength;   // I set up the tail length in a counter
     for (i=0; i<lineSize; i++)
   {
     digitalWrite(pinArray[i],HIGH); // I light up consecutively the LEDs
     delay(waitStart);            // This time variable controles how fast I light them up
     if (tailCounter == 0)
      {
        digitalWrite(pinArray[i-tailLength],LOW); // I turn off the LEDs depending on my tailLength
      }
     else
       if (tailCounter > 0)
         tailCounter--;
   }
    for (i=(lineSize-tailLength); i<lineSize; i++)
   {
     digitalWrite(pinArray[i],LOW); // I turn off the LEDs
     delay(waitStart);            // This time variable controles how fast I light them upm, and turn off as well
   }
}