Number of length n+3 0..2 arrays with no four elements in a row with pattern aabb (possibly a=b) and new values 0..2 introduced in 0..2 order.

A242543

Number of length n+3 0..2 arrays with no four elements in a row with pattern aabb (possibly a=b) and new values 0..2 introduced in 0..2 order.

Terms

    a(0) =12a(1) =32a(2) =88a(3) =242a(4) =660a(5) =1800a(6) =4920a(7) =13448a(8) =36736a(9) =100352a(10) =274176a(11) =749088a(12) =2046528a(13) =5591168a(14) =15275392a(15) =41733248a(16) =114017280a(17) =311500800a(18) =851036160a(19) =2325074432a(20) =6352221184a(21) =17354590208a(22) =47413622784a(23) =129536428032a(24) =353900101632

External references