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, 1), (-1, 1, 0), (1, 0, 0), (1, 1, -1)}.
A148647
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, 1), (-1, 1, 0), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =23a(5) =62a(6) =263a(7) =815a(8) =3641a(9) =12300a(10) =56667a(11) =202971a(12) =954066a(13) =3564277a(14) =16985607a(15) =65498160a(16) =315209452a(17) =1245818035a(18) =6039009631a(19) =24343527621a(20) =118650810900a(21) =486056238279
External references
- oeis: A148647