Number of nX4 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 0 vertically.
A207956
Number of nX4 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 0 0 vertically.
Terms
- a(0) =9a(1) =81a(2) =281a(3) =989a(4) =3923a(5) =15921a(6) =67007a(7) =286299a(8) =1240603a(9) =5420023a(10) =23828357a(11) =105188575a(12) =465711669a(13) =2065999789a(14) =9177987717a(15) =40811215453a(16) =181593070243a(17) =808383490865
External references
- oeis: A207956