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, 0, 0), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
A148928
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, 0, 0), (0, -1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =27a(5) =97a(6) =343a(7) =1257a(8) =4838a(9) =18667a(10) =73563a(11) =296072a(12) =1196444a(13) =4906843a(14) =20317977a(15) =84581199a(16) =355455832a(17) =1502010343a(18) =6379990024a(19) =27262864080a(20) =116966557176a(21) =503988871237
External references
- oeis: A148928