Difference between 2^n and the next larger or equal power of 3.

Terms

a(0) =0a(1) =1a(2) =5a(3) =1a(4) =11a(5) =49a(6) =17a(7) =115a(8) =473a(9) =217a(10) =1163a(11) =139a(12) =2465a(13) =11491a(14) =3299a(15) =26281a(16) =111611a(17) =46075a(18) =269297a(19) =7153a(20) =545747a(21) =2685817a(22) =588665a(23) =5960299a(24) =26269505a(25) =9492289a(26) =62031299a(27) =253202761a(28) =118985033a(29) =625390555