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), (0, 1, 1), (1, -1, 0), (1, 0, -1)}.
A149028
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), (0, 1, 1), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =32a(5) =116a(6) =450a(7) =1727a(8) =6837a(9) =28060a(10) =115565a(11) =481369a(12) =2040532a(13) =8708109a(14) =37423501a(15) =162231361a(16) =707449871a(17) =3102033992a(18) =13670214098a(19) =60514683165a(20) =269035757552
External references
- oeis: A149028