Number of North-East lattice paths from (0,0) to (n,n) that bounce off the diagonal y = x to the right exactly three times.
A268401
Number of North-East lattice paths from (0,0) to (n,n) that bounce off the diagonal y = x to the right exactly three times.
Terms
- a(0) =1a(1) =6a(2) =31a(3) =146a(4) =655a(5) =2850a(6) =12148a(7) =51028a(8) =212039a(9) =873870a(10) =3578404a(11) =14578576a(12) =59149381a(13) =239177006a(14) =964439355a(15) =3879856458a(16) =15577609711a(17) =62439489346a(18) =249917575553a(19) =999080441830
External references
- oeis: A268401