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

A153363

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

Terms

    a(0) =5a(1) =8a(2) =16a(3) =28a(4) =56a(5) =100a(6) =200a(7) =360a(8) =720a(9) =1300a(10) =2600a(11) =4700a(12) =9400a(13) =17000a(14) =34000a(15) =61500a(16) =123000a(17) =222500a(18) =445000a(19) =805000a(20) =1610000a(21) =2912500a(22) =5825000a(23) =10537500a(24) =21075000a(25) =38125000a(26) =76250000a(27) =137937500a(28) =275875000a(29) =499062500

External references