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, 0, 1), (1, -1, 1), (1, 1, -1)}.
A148494
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, 0, 1), (1, -1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =21a(5) =81a(6) =330a(7) =1379a(8) =5943a(9) =26192a(10) =117531a(11) =534629a(12) =2459298a(13) =11413397a(14) =53365727a(15) =251094785a(16) =1187772059a(17) =5644400172a(18) =26929252668a(19) =128922697132a(20) =619083834686
External references
- oeis: A148494