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), (0, 1, 1), (1, 0, -1)}.
A150116
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), (0, 1, 1), (1, 0, -1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =19a(4) =71a(5) =265a(6) =1058a(7) =4252a(8) =17711a(9) =74131a(10) =317076a(11) =1362358a(12) =5935160a(13) =25963188a(14) =114651556a(15) =508135189a(16) =2267288700a(17) =10148900369a(18) =45657273028a(19) =205973658612a(20) =932807045180
External references
- oeis: A150116