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), (0, 0, -1), (0, 0, 1), (0, 1, -1), (1, 0, 0)}.
A150050
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), (0, 0, -1), (0, 0, 1), (0, 1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =18a(4) =61a(5) =216a(6) =805a(7) =3106a(8) =12273a(9) =49713a(10) =204584a(11) =856073a(12) =3627081a(13) =15541148a(14) =67265699a(15) =293557472a(16) =1291371759a(17) =5718657166a(18) =25482111083a(19) =114180541557a(20) =514173146013
External references
- oeis: A150050