Number of zig-zag paths from top to bottom of a rectangle of width 9 with 2*n rows whose color is that of the top right corner.

A153365

Number of zig-zag paths from top to bottom of a rectangle of width 9 with 2*n rows whose color is that of the top right corner.

Terms

    a(0) =8a(1) =28a(2) =100a(3) =360a(4) =1300a(5) =4700a(6) =17000a(7) =61500a(8) =222500a(9) =805000a(10) =2912500a(11) =10537500a(12) =38125000a(13) =137937500a(14) =499062500a(15) =1805625000a(16) =6532812500a(17) =23635937500a(18) =85515625000a(19) =309398437500

External references