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, 0, -1), (-1, 0, 1), (0, 1, 0), (1, 0, 0)}.
A149921
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, 0, -1), (-1, 0, 1), (0, 1, 0), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =47a(5) =158a(6) =546a(7) =1959a(8) =7186a(9) =26752a(10) =101598a(11) =390218a(12) =1515442a(13) =5942431a(14) =23505016a(15) =93645233a(16) =375351768a(17) =1514057193a(18) =6138079032a(19) =24996491647a(20) =102243003319a(21) =419849010522
External references
- oeis: A149921