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), (-1, 1, 0), (0, -1, 1), (1, 0, -1), (1, 0, 0)}.
A148719
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), (-1, 1, 0), (0, -1, 1), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =24a(5) =75a(6) =273a(7) =988a(8) =3794a(9) =14836a(10) =59589a(11) =244016a(12) =1015631a(13) =4291133a(14) =18352558a(15) =79372931a(16) =346600452a(17) =1526645660a(18) =6776111394a(19) =30285544364a(20) =136203226108a(21) =616034525360
External references
- oeis: A148719