Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 101-111-101 pattern in any orientation.

A146431

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 101-111-101 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =1a(4) =3a(5) =1a(6) =9a(7) =3a(8) =31a(9) =9a(10) =301a(11) =19a(12) =1647a(13) =53a(14) =11872a(15) =531a(16) =136892a(17) =5709a(18) =3186390a(19) =48307a(20) =72335276a(21) =490649a(22) =1826857009a(23) =11283333a(24) =67665636761a(25) =359196547a(27) =11541091447a(29) =440660012263

External references