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, 1), (-1, 1, 0), (1, -1, 0), (1, 0, -1), (1, 0, 0)}.
A148730
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, 1), (-1, 1, 0), (1, -1, 0), (1, 0, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =73a(6) =285a(7) =955a(8) =3919a(9) =14305a(10) =60725a(11) =234803a(12) =1021695a(13) =4117745a(14) =18255063a(15) =75905883a(16) =341433697a(17) =1454584649a(18) =6619281441a(19) =28750556287a(20) =132079753073a(21) =582781728613
External references
- oeis: A148730