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, 1, -1), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
A148650
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, 1, -1), (0, 0, 1), (1, 0, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =24a(5) =60a(6) =247a(7) =725a(8) =3142a(9) =9976a(10) =44566a(11) =150364a(12) =683268a(13) =2409852a(14) =11098347a(15) =40453800a(16) =188206351a(17) =704307402a(18) =3302109484a(19) =12625419479a(20) =59563688027a(21) =231816392010
External references
- oeis: A148650