Bitmasks that can be used to generate a sequence of all positive integers up to 2^n.

Terms

a(0) =3a(1) =6a(2) =12a(3) =20a(4) =48a(5) =96a(6) =184a(7) =272a(8) =576a(9) =1280a(10) =3232a(11) =6912a(12) =13568a(13) =24576a(14) =46080a(15) =73728a(16) =132096a(17) =466944a(18) =589824a(19) =1310720a(20) =3145728a(21) =4194304a(22) =14155776a(23) =18874368a(24) =59244544a(25) =119537664a(26) =150994944a(27) =335544320a(28) =847249408a(29) =1207959552