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, -1), (0, 1, 1), (1, -1, -1)}.
A148050
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, -1), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =10a(5) =20a(6) =58a(7) =139a(8) =458a(9) =1160a(10) =3818a(11) =10392a(12) =34670a(13) =97442a(14) =333818a(15) =969459a(16) =3328978a(17) =9938088a(18) =34450338a(19) =104523080a(20) =366290046a(21) =1131762090a(22) =3975840690a(23) =12469787368a(24) =44066215102a(25) =139601191058a(26) =496316131002
External references
- oeis: A148050