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, 0, 1), (0, 1, 1), (1, -1, 1), (1, 0, -1)}.
A149005
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, 0, 1), (0, 1, 1), (1, -1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =34a(5) =120a(6) =480a(7) =1864a(8) =7724a(9) =31399a(10) =133843a(11) =559593a(12) =2429122a(13) =10390671a(14) =45665183a(15) =198653628a(16) =881804068a(17) =3883630079a(18) =17376449963a(19) =77271811239a(20) =347946089164
External references
- oeis: A149005