a(n) = n*2^n - 2^n = 2^n*(n-1).

Terms

a(0) =0a(1) =4a(2) =16a(3) =48a(4) =128a(5) =320a(6) =768a(7) =1792a(8) =4096a(9) =9216a(10) =20480a(11) =45056a(12) =98304a(13) =212992a(14) =458752a(15) =983040a(16) =2097152a(17) =4456448a(18) =9437184a(19) =19922944a(20) =41943040a(21) =88080384a(22) =184549376a(23) =385875968a(24) =805306368a(25) =1677721600a(26) =3489660928a(27) =7247757312a(28) =15032385536a(29) =31138512896