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, 1), (1, 0, 1), (1, 1, -1)}.
A148889
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, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =31a(5) =98a(6) =384a(7) =1379a(8) =5717a(9) =21582a(10) =90906a(11) =359436a(12) =1547240a(13) =6258149a(14) =27323155a(15) =113033282a(16) =498661277a(17) =2092486392a(18) =9327901281a(19) =39645561390a(20) =177854351272a(21) =763667457504
External references
- oeis: A148889