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), (-1, 0, 1), (1, 0, -1), (1, 1, 0)}.
A148751
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), (-1, 0, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =28a(5) =77a(6) =321a(7) =1023a(8) =4410a(9) =15048a(10) =66633a(11) =238610a(12) =1073045a(13) =3988056a(14) =18140939a(15) =69296462a(16) =318128048a(17) =1241740863a(18) =5741014612a(19) =22809183833a(20) =106052749451a(21) =427559326268
External references
- oeis: A148751