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, -1, 1), (0, 1, -1), (1, 0, 1)}.
A148172
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, -1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =27a(6) =84a(7) =224a(8) =700a(9) =1994a(10) =6638a(11) =19089a(12) =64876a(13) =198363a(14) =664004a(15) =2086517a(16) =7239154a(17) =22617762a(18) =79274478a(19) =257022722a(20) =887577052a(21) =2920427735a(22) =10343306126a(23) =33734494280a(24) =120217932914a(25) =402661589406
External references
- oeis: A148172