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, 0, 0), (-1, 1, 1), (0, -1, 1), (1, 0, 0), (1, 1, -1)}.
A148739
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, 0, 0), (-1, 1, 1), (0, -1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =86a(6) =342a(7) =1382a(8) =5856a(9) =25260a(10) =111301a(11) =497087a(12) =2247763a(13) =10267545a(14) =47299472a(15) =219526072a(16) =1025314405a(17) =4815497410a(18) =22726304664a(19) =107713530687a(20) =512449081616
External references
- oeis: A148739