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, 1), (0, 1, 1), (1, -1, 1), (1, 0, -1)}.
A148946
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, 1), (0, 1, 1), (1, -1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =30a(5) =100a(6) =358a(7) =1274a(8) =4696a(9) =17271a(10) =64812a(11) =243124a(12) =923171a(13) =3507259a(14) =13429612a(15) =51468323a(16) =198303497a(17) =764804869a(18) =2960762145a(19) =11473325435a(20) =44582616732a(21) =173402227469a(22) =675831532852
External references
- oeis: A148946