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, -1), (-1, -1, 0), (-1, -1, 1), (0, 1, -1), (1, 0, 1)}.
A148339
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, -1), (-1, -1, 0), (-1, -1, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =38a(6) =126a(7) =403a(8) =1267a(9) =4364a(10) =15337a(11) =51008a(12) =186733a(13) =677566a(14) =2371655a(15) =8911984a(16) =33363459a(17) =120099472a(18) =461730365a(19) =1762385298a(20) =6489781432a(21) =25333729456a(22) =98240077694a(23) =367777089473
External references
- oeis: A148339