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, 0), (-1, 0, 0), (1, 0, -1), (1, 1, 1)}.
A149246
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, 0), (-1, 0, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =38a(5) =116a(6) =440a(7) =1453a(8) =5450a(9) =18714a(10) =71816a(11) =253494a(12) =972292a(13) =3492890a(14) =13529192a(15) =49328285a(16) =191161466a(17) =703792642a(18) =2742710728a(19) =10191899732a(20) =39738557836a(21) =148580923814a(22) =581445525832
External references
- oeis: A149246