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), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
A148661
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), (-1, 1, 1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =25a(5) =66a(6) =283a(7) =840a(8) =3756a(9) =12069a(10) =54948a(11) =186098a(12) =858580a(13) =3022402a(14) =14080499a(15) =51067222a(16) =239576208a(17) =889609995a(18) =4197132776a(19) =15888680266a(20) =75300462988a(21) =289674695513
External references
- oeis: A148661