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), (-1, 1, 1), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
A148980
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), (-1, 1, 1), (0, -1, 0), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =32a(5) =112a(6) =416a(7) =1600a(8) =6303a(9) =25287a(10) =103015a(11) =425429a(12) =1777767a(13) =7500273a(14) =31915140a(15) =136814101a(16) =590457109a(17) =2563483906a(18) =11188928245a(19) =49072703877a(20) =216169809953a(21) =956076808622
External references
- oeis: A148980