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, 1), (1, -1, 0), (1, 1, -1), (1, 1, 0)}.
A149351
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, 1), (1, -1, 0), (1, 1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =42a(5) =156a(6) =606a(7) =2394a(8) =9804a(9) =40802a(10) =172286a(11) =738337a(12) =3202001a(13) =14007442a(14) =61830248a(15) =275035783a(16) =1231198753a(17) =5544051454a(18) =25101208259a(19) =114181560904a(20) =521629518564
External references
- oeis: A149351