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, 1), (-1, 1, 0), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
A149420
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, 1), (-1, 1, 0), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =56a(5) =191a(6) =919a(7) =3461a(8) =16942a(9) =67024a(10) =330985a(11) =1351694a(12) =6706020a(13) =28005748a(14) =139322499a(15) =591548083a(16) =2947755005a(17) =12676627994a(18) =63236396201a(19) =274723412297
External references
- oeis: A149420