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, -1, 0), (1, 0, 1), (1, 1, -1)}.
A148837
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, -1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =90a(6) =319a(7) =1105a(8) =4149a(9) =15493a(10) =59629a(11) =229194a(12) =900664a(13) =3530956a(14) =14135609a(15) =56599631a(16) =229358331a(17) =930827351a(18) =3812208905a(19) =15624431923a(20) =64600726602a(21) =267503851270
External references
- oeis: A148837