INVERT transform of (1, 3, 1, 3, 1, ...).

Terms

a(0) =1a(1) =4a(2) =8a(3) =24a(4) =56a(5) =152a(6) =376a(7) =984a(8) =2488a(9) =6424a(10) =16376a(11) =42072a(12) =107576a(13) =275864a(14) =706168a(15) =1809624a(16) =4634296a(17) =11872792a(18) =30409976a(19) =77901144a(20) =199541048a(21) =511145624a(22) =1309309816a(23) =3353892312a(24) =8591131576a(25) =22006700824a(26) =56371227128a(27) =144398030424a(28) =369882938936a(29) =947475060632