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, 0, -1), (0, 1, 0), (1, 0, 1)}.
A150247
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, 0, -1), (0, 1, 0), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =22a(4) =85a(5) =331a(6) =1346a(7) =5615a(8) =23857a(9) =102160a(10) =443129a(11) =1940684a(12) =8571239a(13) =38036998a(14) =169848175a(15) =762225515a(16) =3436614595a(17) =15543298890a(18) =70556551894a(19) =321264697335
External references
- oeis: A150247