A050876 Base 3 numbers d(1)...d(j) such that d(i)<>d(j+1-i) for all but 2 i.

27, 29, 31, 34, 37, 39, 41, 43, 46, 49, 51, 53, 54, 55, 59, 62, 65, 66, 67, 71, 74, 77, 78, 79, 81, 83, 85, 88, 90, 92, 94, 97, 99, 101, 103, 106, 109, 111, 113, 115, 118, 120, 122, 124, 127, 129, 131, 133, 136, 139, 141, 143, 145, 148, 150, 152