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), (1, -1, 0), (1, 1, -1)}.
A148378
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), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =16a(5) =47a(6) =149a(7) =509a(8) =1811a(9) =6501a(10) =23500a(11) =87528a(12) =333240a(13) =1282800a(14) =4941756a(15) =19289046a(16) =76350649a(17) =304668603a(18) =1219623844a(19) =4905122881a(20) =19901109559a(21) =81288145985a(22) =333294421707
External references
- oeis: A148378