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, 0, 1), (-1, 1, 0), (1, -1, 0), (1, 0, -1), (1, 0, 1)}.
A149389
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, 0, 1), (-1, 1, 0), (1, -1, 0), (1, 0, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =12a(4) =50a(5) =177a(6) =775a(7) =3047a(8) =13758a(9) =57469a(10) =264763a(11) =1149410a(12) =5370333a(13) =23939506a(14) =113009053a(15) =513522505a(16) =2443191002a(17) =11263682171a(18) =53918582307a(19) =251379375951
External references
- oeis: A149389