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), (-1, 1, 0), (1, 0, -1), (1, 1, 1)}.
A149624
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), (-1, 1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =67a(5) =215a(6) =1043a(7) =3861a(8) =18385a(9) =69261a(10) =338609a(11) =1353969a(12) =6559381a(13) =26398681a(14) =129688109a(15) =539731863a(16) =2636124491a(17) =11003741583a(18) =54223215931a(19) =231338016843
External references
- oeis: A149624