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, 0, -1), (1, 0, 0), (1, 1, -1)}.
A148318
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, 0, -1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =39a(6) =125a(7) =406a(8) =1377a(9) =4764a(10) =17164a(11) =62469a(12) =231943a(13) =874618a(14) =3351026a(15) =12947298a(16) =50620338a(17) =199901919a(18) =795986823a(19) =3191015723a(20) =12892664497a(21) =52428537370a(22) =214363751334a(23) =881152162009
External references
- oeis: A148318