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, 1), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
A150210
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, 1), (0, 1, -1), (0, 1, 1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =21a(4) =81a(5) =321a(6) =1321a(7) =5568a(8) =23764a(9) =102870a(10) =450340a(11) =1986400a(12) =8825121a(13) =39457461a(14) =177281922a(15) =800039478a(16) =3624959411a(17) =16480216689a(18) =75150063335a(19) =343637229865
External references
- oeis: A150210