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), (-1, 0, 1), (0, 1, 1), (1, 0, 0)}.
A149989
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), (-1, 0, 1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =17a(4) =57a(5) =207a(6) =765a(7) =2881a(8) =11179a(9) =43677a(10) =173480a(11) =693553a(12) =2797983a(13) =11382137a(14) =46538292a(15) =191449223a(16) =790709157a(17) =3281073206a(18) =13667322149a(19) =57117349582a(20) =239451649152
External references
- oeis: A149989