A145863 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in two by two blocks.

1, 2, 1, 2, 2, 7, 7, 22, 24, 108, 150, 786, 1301, 8045, 15509, 116985, 273970, 2472105, 6959192, 74864863, 250693524, 3242639202, 13050355068, 202176993015, 975396539666, 18089511084508, 104443510575847, 2322049495419469