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, 0, 1), (0, 1, 1), (1, 0, -1)}.
A150106
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, 0, 1), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =19a(4) =69a(5) =258a(6) =1009a(7) =4051a(8) =16620a(9) =69339a(10) =293485a(11) =1255837a(12) =5427580a(13) =23650266a(14) =103780197a(15) =458260421a(16) =2034519989a(17) =9075959960a(18) =40663040317a(19) =182882049074a(20) =825372922736
External references
- oeis: A150106