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, 0), (1, -1, -1), (1, 0, -1), (1, 1, 0)}.
A148620
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, 0), (1, -1, -1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =21a(5) =59a(6) =209a(7) =662a(8) =2496a(9) =8515a(10) =32894a(11) =117885a(12) =466161a(13) =1733099a(14) =6963382a(15) =26575122a(16) =108190950a(17) =421856886a(18) =1735558762a(19) =6880283932a(20) =28555059050a(21) =114783948373a(22) =479915857088
External references
- oeis: A148620