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, 0), (0, 1, -1), (1, 0, -1), (1, 0, 1)}.
A149319
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, 0), (0, 1, -1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =37a(5) =139a(6) =511a(7) =1889a(8) =7386a(9) =29461a(10) =117067a(11) =474619a(12) =1967869a(13) =8140890a(14) =33951702a(15) =143818185a(16) =610812118a(17) =2601204085a(18) =11183931168a(19) =48341357130a(20) =209165014365a(21) =909994942656
External references
- oeis: A149319