>>4913447 (PB)

[1 2] 4 [5] 7 8 … have you learned to read the message?

>>4913632

1

1 2 1

1 3 3 1

1 4 6 4 1

1 5 10 10 5 1

1 6 15 20 15 6 1

Did you notice 4, 10, 20 on the diagonal?

What does the sequence 2^n have to do with this?