byte infinity[] = {1, 6, 7, 3, 4, 5, 7, 2};

int power(int x, unsigned n)
{
  int pow = 1;
  for (int i = 0; i < n; i++) {
    pow = pow * x;
  }
  return pow;
}

void setup() {
  pinMode(8, OUTPUT);
  digitalWrite(8, 1);
  for (byte i = 1; i < 8; i++) {
    pinMode(i, OUTPUT);
    digitalWrite(i, 0);
  }
}

void loop() {
  for (byte i = 0; i < sizeof(infinity) / sizeof(byte); i++) {
    PORTD = power(2, infinity[i]) ^ 0b11111111;
    delay(500);
  }
}