A046470 Even numbers with an odd number of prime factors (counted with multiplicity).

2, 8, 12, 18, 20, 28, 30, 32, 42, 44, 48, 50, 52, 66, 68, 70, 72, 76, 78, 80, 92, 98, 102, 108, 110, 112, 114, 116, 120, 124, 128, 130, 138, 148, 154, 162, 164, 168, 170, 172, 174, 176, 180, 182, 186, 188, 190, 192, 200, 208, 212, 222, 230, 236, 238, 242, 244