Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.
A146998
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =8a(7) =23a(8) =61a(9) =183a(10) =609a(11) =3021a(12) =17551a(13) =122559a(14) =936997a(15) =8112490a(16) =77983308a(17) =921842339a(18) =13073413646a(19) =221502161483
External references
- oeis: A146998