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), (0, 1, 1), (1, 0, -1)}.
A148289
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), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =13a(5) =34a(6) =102a(7) =304a(8) =925a(9) =2930a(10) =9314a(11) =30227a(12) =99654a(13) =329616a(14) =1106171a(15) =3739369a(16) =12717657a(17) =43624104a(18) =150207317a(19) =520337650a(20) =1811959226a(21) =6331767583a(22) =22228799924a(23) =78284646709a(24) =276640110054a(25) =980924228341
External references
- oeis: A148289