Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 0), (1, 0, 0), (1, 1, -1)}.
A148026
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =8a(5) =17a(6) =50a(7) =123a(8) =396a(9) =1073a(10) =3584a(11) =10339a(12) =35708a(13) =108047a(14) =382030a(15) =1198693a(16) =4313758a(17) =13924021a(18) =50809793a(19) =167788571a(20) =619059420a(21) =2082876857a(22) =7753892022a(23) =26497831246a(24) =99373513569a(25) =344089136230
External references
- oeis: A148026