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), (0, -1, 1), (0, 1, 0), (1, -1, 0), (1, 0, -1)}.
A148688
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), (0, -1, 1), (0, 1, 0), (1, -1, 0), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =22a(5) =69a(6) =232a(7) =812a(8) =2933a(9) =10868a(10) =41176a(11) =158896a(12) =622615a(13) =2473326a(14) =9941501a(15) =40377341a(16) =165508498a(17) =684061812a(18) =2848337029a(19) =11939734114a(20) =50355254586a(21) =213555500201a(22) =910306132464
External references
- oeis: A148688