Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1111-1111 pattern in any orientation.

A146936

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1111-1111 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =7a(7) =14a(8) =39a(9) =110a(10) =377a(11) =1728a(12) =8445a(13) =46261a(14) =295085a(15) =2140608a(16) =18281422a(17) =182971434a(18) =2102657419a(19) =27813973723a(20) =424019281880

External references