a(1) = 1; for n > 1, a(n) = 2*a(n-1) if n is even, a(n) = ((n+1)/(n-1))*a(n-1) if n is odd.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =12a(5) =24a(6) =32a(7) =64a(8) =80a(9) =160a(10) =192a(11) =384a(12) =448a(13) =896a(14) =1024a(15) =2048a(16) =2304a(17) =4608a(18) =5120a(19) =10240a(20) =11264a(21) =22528a(22) =24576a(23) =49152a(24) =53248a(25) =106496a(26) =114688a(27) =229376a(28) =245760a(29) =491520