Number of zig-zag paths from top to bottom of a rectangle of width 9 with 2*n-1 rows whose color is that of the top right corner.
A153366
Number of zig-zag paths from top to bottom of a rectangle of width 9 with 2*n-1 rows whose color is that of the top right corner.
Terms
- a(0) =5a(1) =16a(2) =56a(3) =200a(4) =720a(5) =2600a(6) =9400a(7) =34000a(8) =123000a(9) =445000a(10) =1610000a(11) =5825000a(12) =21075000a(13) =76250000a(14) =275875000a(15) =998125000a(16) =3611250000a(17) =13065625000a(18) =47271875000a(19) =171031250000a(20) =618796875000
External references
- oeis: A153366