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, -1, 1), (-1, 0, 1), (1, 0, -1), (1, 1, 1)}.
A149617
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, -1, 1), (-1, 0, 1), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =65a(5) =231a(6) =1049a(7) =4011a(8) =18485a(9) =74073a(10) =344159a(11) =1420619a(12) =6640395a(13) =27983731a(14) =131369483a(15) =562216845a(16) =2647935169a(17) =11468400275a(18) =54152874967a(19) =236788885161
External references
- oeis: A149617