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, 1, 1), (0, 0, 1), (1, 0, -1), (1, 0, 1)}.
A150421
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, 1, 1), (0, 0, 1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =24a(4) =95a(5) =381a(6) =1620a(7) =6952a(8) =30527a(9) =135709a(10) =611338a(11) =2780105a(12) =12737432a(13) =58751582a(14) =272577928a(15) =1271185910a(16) =5954217923a(17) =27994989600a(18) =132078328817a(19) =625071178375
External references
- oeis: A150421