A059156 A hierarchical sequence (W'3{2,2}c - see A059126).

4, 16, 4, 64, 256, 64, 4, 16, 4, 1024, 4096, 1024, 4, 16, 4, 64, 256, 64, 4, 16, 4, 16384, 65536, 16384, 4, 16, 4, 64, 256, 64, 4, 16, 4, 1024, 4096, 1024, 4, 16, 4, 64, 256, 64, 4, 16, 4, 262144, 1048576, 262144, 4, 16, 4, 64, 256, 64, 4, 16, 4, 1024, 4096, 1024, 4