Difference between 3^n and highest power of 2 less than or equal to 3^n.

Terms

a(0) =0a(1) =1a(2) =1a(3) =11a(4) =17a(5) =115a(6) =217a(7) =139a(8) =2465a(9) =3299a(10) =26281a(11) =46075a(12) =7153a(13) =545747a(14) =588665a(15) =5960299a(16) =9492289a(17) =62031299a(18) =118985033a(19) =88519643a(20) =1339300753a(21) =1870418611a(22) =14201190425a(23) =25423702091a(24) =7551629537