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, 0, 0)}.
A150199
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, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =79a(5) =312a(6) =1280a(7) =5350a(8) =22785a(9) =98425a(10) =429352a(11) =1891118a(12) =8390213a(13) =37452536a(14) =168120184a(15) =758079627a(16) =3432228560a(17) =15595725843a(18) =71086288088a(19) =324940108298
External references
- oeis: A150199