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), (1, 0, 0), (1, 1, 0)}.
A150311
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), (1, 0, 0), (1, 1, 0)}.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =21a(4) =86a(5) =300a(6) =1307a(7) =4908a(8) =22093a(9) =86772a(10) =398829a(11) =1614603a(12) =7528347a(13) =31153064a(14) =146762091a(15) =617483907a(16) =2931761937a(17) =12497031704a(18) =59698007965a(19) =257166533447
External references
- oeis: A150311