Number of positive walks with n steps {-4,-3,-2,-1,1,2,3,4} starting at the origin, ending at altitude 1, and staying strictly above the x-axis.
A277922
Number of positive walks with n steps {-4,-3,-2,-1,1,2,3,4} starting at the origin, ending at altitude 1, and staying strictly above the x-axis.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =13a(4) =71a(5) =405a(6) =2501a(7) =15923a(8) =104825a(9) =704818a(10) =4827957a(11) =33549389a(12) =235990887a(13) =1676907903a(14) =12019875907a(15) =86804930199a(16) =630999932585
External references
- oeis: A277922