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, 1), (1, -1, -1), (1, 1, -1), (1, 1, 1)}.
A149649
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, 1), (1, -1, -1), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =71a(5) =265a(6) =1261a(7) =5203a(8) =24955a(9) =108585a(10) =524197a(11) =2355797a(12) =11426453a(13) =52469187a(14) =255398251a(15) =1190735689a(16) =5812102729a(17) =27403169351a(18) =134056152587a(19) =637477945257
External references
- oeis: A149649