One of the two successive approximations up to 3^n for the 3-adic integer sqrt(-1/2).

Terms

a(0) =0a(1) =1a(2) =7a(3) =16a(4) =70a(5) =232a(6) =475a(7) =1933a(8) =1933a(9) =8494a(10) =28177a(11) =87226a(12) =87226a(13) =1150108a(14) =2744431a(15) =12310369a(16) =12310369a(17) =55357090a(18) =313637416a(19) =313637416a(20) =1475898883a(21) =1475898883a(22) =1475898883a(23) =32856958492a(24) =221143316146a(25) =221143316146