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, 0), (0, -1, 1), (1, 0, -1), (1, 1, 0)}.
A148777
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, 0), (0, -1, 1), (1, 0, -1), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =23a(5) =73a(6) =234a(7) =776a(8) =2644a(9) =9083a(10) =31798a(11) =112573a(12) =401632a(13) =1447849a(14) =5250062a(15) =19159941a(16) =70348134a(17) =259380839a(18) =960905588a(19) =3573310663a(20) =13333335695a(21) =49921215233a(22) =187424343330a(23) =705582305317
External references
- oeis: A148777