Led Strobe Lights (Multi Patterns) Help

Ok, I now understand how it is done. But this Pattern im looking for is a bit more complicated. does anyone know gow i should convert this code into without delay?

More simplified version of it...>

int led = 13;
int led2 = 12;

void setup() {

pinMode(led, OUTPUT);
pinMode(led2, OUTPUT);
}

void loop() {
digitalWrite(led2, LOW) //Strobe
;
digitalWrite(led, HIGH);
delay(20);
digitalWrite(led, LOW);
delay(50);
digitalWrite(led, HIGH);
delay(20);
digitalWrite(led, LOW);
delay(50);
digitalWrite(led, HIGH);
delay(20);
digitalWrite(led, LOW);
delay(50);
digitalWrite(led, HIGH);
delay(250);
digitalWrite(led, LOW);
digitalWrite(led2, HIGH);
delay(20);
digitalWrite(led2, LOW);
delay(50);
digitalWrite(led2, HIGH);
delay(20);
digitalWrite(led2, LOW);
delay(50);
digitalWrite(led2, HIGH);
delay(20);
digitalWrite(led2, LOW);
delay(50);
digitalWrite(led2, HIGH);
delay(250);
digitalWrite(led2, LOW);
}