Half the number of nX2 binary arrays with each element equal to at least one neighbor.

A180762

Half the number of nX2 binary arrays with each element equal to at least one neighbor.

Terms

    a(0) =1a(1) =3a(2) =11a(3) =34a(4) =111a(5) =361a(6) =1172a(7) =3809a(8) =12377a(9) =40218a(10) =130687a(11) =424661a(12) =1379916a(13) =4483973a(14) =14570461a(15) =47346034a(16) =153848731a(17) =499924281a(18) =1624480652a(19) =5278674169a(20) =17152805697a(21) =55737242698a(22) =181115572487a(23) =588526611821

External references