Number of n X 4 binary arrays with each 1 adjacent to exactly two 0's.

A183332

Number of n X 4 binary arrays with each 1 adjacent to exactly two 0's.

Terms

    a(0) =3a(1) =23a(2) =66a(3) =247a(4) =899a(5) =3254a(6) =11883a(7) =43207a(8) =157266a(9) =572571a(10) =2084227a(11) =7587166a(12) =27619131a(13) =100540587a(14) =365994058a(15) =1332312171a(16) =4849957923a(17) =17655092138a(18) =64269069107a(19) =233955917683a(20) =851659617442

External references