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), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
A148848
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), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =8a(4) =28a(5) =91a(6) =325a(7) =1148a(8) =4210a(9) =15417a(10) =57694a(11) =215581a(12) =817502a(13) =3096572a(14) =11845074a(15) =45302298a(16) =174388276a(17) =671564376a(18) =2597822666a(19) =10054975765a(20) =39046176946a(21) =151720773774a(22) =590988865435
External references
- oeis: A148848