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, 0), (-1, 0, 1), (1, -1, -1), (1, 1, 0)}.
A148606
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, 0), (-1, 0, 1), (1, -1, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =21a(5) =53a(6) =202a(7) =569a(8) =2269a(9) =6921a(10) =28091a(11) =90733a(12) =374381a(13) =1254516a(14) =5256896a(15) =18121472a(16) =76678632a(17) =270887921a(18) =1154021680a(19) =4157771336a(20) =17826825668a(21) =65238490608a(22) =281261324798
External references
- oeis: A148606