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, 0), (-1, 0, -1), (0, 0, 1), (1, -1, -1), (1, 1, 0)}.
A149985
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, 0), (-1, 0, -1), (0, 0, 1), (1, -1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =55a(5) =200a(6) =737a(7) =2810a(8) =10993a(9) =43563a(10) =176307a(11) =717457a(12) =2968511a(13) =12319177a(14) =51739914a(15) =218083622a(16) =926385446a(17) =3953155545a(18) =16951252816a(19) =73047645626a(20) =315747238313
External references
- oeis: A149985