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, 0, -1), (0, -1, -1), (1, 1, 1)}.
A149496
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, 0, -1), (0, -1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =9a(4) =45a(5) =109a(6) =497a(7) =1505a(8) =6133a(9) =21789a(10) =82533a(11) =321777a(12) =1194945a(13) =4811085a(14) =18219585a(15) =73076577a(16) =286306473a(17) =1134972601a(18) =4568099273a(19) =18063724073a(20) =73541366101a(21) =293534062209
External references
- oeis: A149496