Number of positive walks with n steps {-3,-2,-1,0,1,2,3} starting at the origin, ending at altitude 2, and staying strictly above the x-axis.
A276904
Number of positive walks with n steps {-3,-2,-1,0,1,2,3} starting at the origin, ending at altitude 2, and staying strictly above the x-axis.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =14a(4) =68a(5) =358a(6) =1966a(7) =11172a(8) =65104a(9) =387029a(10) =2337919a(11) =14309783a(12) =88555917a(13) =553171371a(14) =3483277785a(15) =22087378303a(16) =140913963221a(17) =903876307075
External references
- oeis: A276904