void setup() {
Serial.begin(9600);
Serial.println("Dec\tOct\tHex\tBin");
}

void loop() {
  for (int i = 1; i <= 20; i++)
{
Serial.print(i);
Serial.print("\t");
Serial.print(i, OCT);
Serial.print("\t ");
Serial.print(i ,HEX);
Serial.print("\t");
Serial.println(i ,BIN);
delay(1000);
}
Serial.println("-----------------------------------------------------------------------------");
Serial.println("Dec\tOct\tHex\tBin");
}