Example of sequencing 3 LEDs without nested array

sequencer.ino

int tempo = 250; // just the delay in milliseconds at the end of loop

const int LED_PIN_1 = 12;
const int LED_PIN_2 = 11;
const int LED_PIN_3 = 10;

unsigned long counter = 0;

int measure = 4;
int sequence1[] = {
  1, 0, 1, 0
};

int sequence2[] = {
  1, 0, 0, 0
};

int sequence3[] = {
  1, 1, 1, 1
};

void setup() {
  pinMode(LED_PIN_1, OUTPUT);
  pinMode(LED_PIN_2, OUTPUT);
  pinMode(LED_PIN_3, OUTPUT);
}

void loop() {
  int beat = counter % measure;
  if (sequence1[beat]) {
    hit(LED_PIN_1);
  }

  if (sequence2[beat]) {
    hit(LED_PIN_2);
  }

  if (sequence3[beat]) {
    hit(LED_PIN_3);
  }

  counter++;
  delay(tempo);
}

void hit(int pin) {
  digitalWrite(pin, HIGH);
  delay(20);
  digitalWrite(pin, LOW);
}