Number of North-East paths from (0,0) to (n,n) that have odd number of times bounce off y = x to the right.
A268431
Number of North-East paths from (0,0) to (n,n) that have odd number of times bounce off y = x to the right.
Terms
- a(0) =1a(1) =4a(2) =17a(3) =68a(4) =270a(5) =1064a(6) =4181a(7) =16404a(8) =64322a(9) =252184a(10) =988890a(11) =3879016a(12) =15222236a(13) =59764048a(14) =234755661a(15) =922591156a(16) =3627586618a(17) =14270426936a(18) =56164324206a(19) =221147123768a(20) =871147242116
External references
- oeis: A268431