Number of n X 4 binary arrays with every 1 having exactly two king-move neighbors equal to 1.

A183445

Number of n X 4 binary arrays with every 1 having exactly two king-move neighbors equal to 1.

Terms

    a(0) =1a(1) =13a(2) =30a(3) =72a(4) =283a(5) =831a(6) =2399a(7) =7761a(8) =23840a(9) =72396a(10) =225569a(11) =696929a(12) =2144537a(13) =6635889a(14) =20510002a(15) =63318408a(16) =195704391a(17) =604826763a(18) =1868678179a(19) =5774848073a(20) =17846507936a(21) =55148861000a(22) =170427655945a(23) =526681961257

External references