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, 0, 0), (0, 0, 1), (1, -1, -1), (1, 1, -1)}.
A148357
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, 0, 0), (0, 0, 1), (1, -1, -1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =45a(6) =150a(7) =500a(8) =1768a(9) =6449a(10) =23952a(11) =90754a(12) =350352a(13) =1366671a(14) =5412378a(15) =21657356a(16) =87478719a(17) =356678716a(18) =1465294690a(19) =6061674645a(20) =25247400391a(21) =105746887056a(22) =445393747063
External references
- oeis: A148357