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, 0), (0, 0, -1), (1, 0, -1), (1, 0, 1)}.
A149251
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, 0), (0, 0, -1), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =11a(4) =38a(5) =135a(6) =535a(7) =1969a(8) =7912a(9) =31803a(10) =131997a(11) =538083a(12) =2286114a(13) =9620153a(14) =41315280a(15) =176490691a(16) =770435360a(17) =3332862297a(18) =14651107025a(19) =64179186301a(20) =284846386574
External references
- oeis: A149251