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, -1), (1, -1, 0), (1, 0, 1)}.
A148609
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, -1), (1, -1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =21a(5) =53a(6) =202a(7) =573a(8) =2276a(9) =6970a(10) =28486a(11) =91784a(12) =382994a(13) =1282178a(14) =5429347a(15) =18715658a(16) =80216031a(17) =282987659a(18) =1224319547a(19) =4402294213a(20) =19195553853a(21) =70115657741a(22) =307739805959
External references
- oeis: A148609