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, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, 0)}.
A148841
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, 0, 1), (0, 1, -1), (0, 1, 1), (1, -1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =93a(6) =330a(7) =1225a(8) =4748a(9) =18254a(10) =72864a(11) =295766a(12) =1202739a(13) =4982093a(14) =20818757a(15) =87599870a(16) =371843504a(17) =1586274436a(18) =6819658928a(19) =29475046107a(20) =127741159201a(21) =557407746280
External references
- oeis: A148841