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, 0, 0), (0, -1, 0), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
A148676
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, 0, 0), (0, -1, 0), (0, 0, 1), (0, 1, -1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =21a(5) =65a(6) =209a(7) =711a(8) =2479a(9) =8843a(10) =32395a(11) =120577a(12) =455385a(13) =1747389a(14) =6778983a(15) =26564107a(16) =105215535a(17) =420078017a(18) =1689539809a(19) =6848322853a(20) =27927549903a(21) =114530918967a(22) =472483367857
External references
- oeis: A148676