Inverse modulo 2 binomial transform of 4^n.

Terms

a(0) =1a(1) =3a(2) =15a(3) =45a(4) =255a(5) =765a(6) =3825a(7) =11475a(8) =65535a(9) =196605a(10) =983025a(11) =2949075a(12) =16711425a(13) =50134275a(14) =250671375a(15) =752014125a(16) =4294967295a(17) =12884901885a(18) =64424509425a(19) =193273528275