Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10000-11111-10000 pattern in any orientation.
A147078
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 10000-11111-10000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =9a(8) =21a(9) =61a(10) =210a(11) =735a(12) =3592a(13) =21789a(14) =146171a(15) =1140039a(16) =10204453a(17) =104577719a(18) =1275721875a(19) =18485616051a(20) =314997048326
External references
- oeis: A147078