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, 0, 1), (0, 1, -1), (1, 0, 1)}.
A148770
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, 0, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =22a(5) =69a(6) =221a(7) =708a(8) =2361a(9) =7974a(10) =27222a(11) =93714a(12) =326352a(13) =1145719a(14) =4034121a(15) =14309172a(16) =51037561a(17) =182498166a(18) =655374727a(19) =2362467329a(20) =8537671487a(21) =30934793788a(22) =112387091102a(23) =409219645036
External references
- oeis: A148770