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), (0, 1, -1), (1, 0, 0), (1, 0, 1)}.
A149948
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), (0, 1, -1), (1, 0, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =50a(5) =174a(6) =641a(7) =2437a(8) =9431a(9) =37579a(10) =152175a(11) =621880a(12) =2586180a(13) =10863494a(14) =45888641a(15) =196085764a(16) =843672956a(17) =3643784480a(18) =15865824267a(19) =69430498992a(20) =304679850430
External references
- oeis: A149948