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, 0, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 0)}.
A148561
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, 0, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =18a(5) =50a(6) =153a(7) =504a(8) =1638a(9) =5769a(10) =20068a(11) =72751a(12) =266169a(13) =988016a(14) =3730735a(15) =14171839a(16) =54628042a(17) =211739875a(18) =828935479a(19) =3265817469a(20) =12950492111a(21) =51683663416a(22) =207238224437a(23) =835593504655
External references
- oeis: A148561