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, 0), (-1, 1, -1), (0, 0, -1), (0, 1, 1), (1, -1, 0)}.
A148780
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, 0), (-1, 1, -1), (0, 0, -1), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =23a(5) =81a(6) =280a(7) =961a(8) =3559a(9) =13454a(10) =50692a(11) =196368a(12) =776979a(13) =3070167a(14) =12268437a(15) =49815796a(16) =203119103a(17) =831940820a(18) =3442970866a(19) =14329445203a(20) =59783757046a(21) =250943394923
External references
- oeis: A148780