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), (-1, 0, 0), (1, 1, 0)}.
A149081
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), (-1, 0, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =7a(4) =30a(5) =63a(6) =281a(7) =649a(8) =2966a(9) =7267a(10) =33747a(11) =86095a(12) =404340a(13) =1062449a(14) =5031420a(15) =13522091a(16) =64446882a(17) =176315923a(18) =844590659a(19) =2344281463a(20) =11275743848a(21) =31674039145a(22) =152866016030a(23) =433754639577
External references
- oeis: A149081