What is the pattern between these numbera???

Question

a1 1
a2 2
a3 3
a4 5
a5 9
a6 15
a7 26
a8 44
a9 75
a10 128
a11 218
a12 372

Answer 1

Based on this sequence, the pattern is:
a[n] = a[n-1] + a[n-2] + a[n-4] , n >= 5