A146254 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 11, 15, 27, 47, 153, 311, 1151, 2849, 13187, 36901, 183137, 600651, 3599693, 14056563, 100844845, 464890609, 3938830471, 21240835037, 209440142193, 1329357548469, 15466899531131, 115875805461919