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, 0, 0), (-1, 1, 1), (0, -1, 0), (0, 1, 1), (1, 0, -1)}.
A148954
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, 0, 0), (-1, 1, 1), (0, -1, 0), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =103a(6) =384a(7) =1448a(8) =5657a(9) =22484a(10) =91109a(11) =373965a(12) =1556099a(13) =6536793a(14) =27720857a(15) =118517912a(16) =510272098a(17) =2210542606a(18) =9632036562a(19) =42184306699a(20) =185588435364a(21) =819950687056
External references
- oeis: A148954