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, -1, 1), (-1, 1, -1), (0, 1, -1), (1, 0, 1)}.
A148740
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, -1, 1), (-1, 1, -1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =7a(4) =26a(5) =80a(6) =281a(7) =1034a(8) =3863a(9) =14359a(10) =56201a(11) =220169a(12) =867848a(13) =3468563a(14) =14062361a(15) =56988945a(16) =232761521a(17) =959409340a(18) =3966388741a(19) =16441169270a(20) =68597731189a(21) =287170234058
External references
- oeis: A148740