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, 0, 1), (1, 0, 0), (1, 1, -1)}.
A150201
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, 0, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =79a(5) =317a(6) =1320a(7) =5665a(8) =24839a(9) =110798a(10) =500952a(11) =2289960a(12) =10562983a(13) =49092460a(14) =229619952a(15) =1079844227a(16) =5102055525a(17) =24204337623a(18) =115235400987a(19) =550350440862
External references
- oeis: A150201