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), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
A149047
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), (0, 1, 1), (1, -1, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =38a(5) =142a(6) =588a(7) =2437a(8) =10461a(9) =45436a(10) =201286a(11) =901394a(12) =4075139a(13) =18588924a(14) =85449323a(15) =395126467a(16) =1837179948a(17) =8584943255a(18) =40290867700a(19) =189791115778a(20) =897095411261
External references
- oeis: A149047