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), (0, 0, 1), (0, 1, -1), (1, 0, 1)}.
A150033
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), (0, 0, 1), (0, 1, -1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =17a(4) =56a(5) =187a(6) =647a(7) =2283a(8) =8183a(9) =29742a(10) =109129a(11) =403667a(12) =1504455a(13) =5637671a(14) =21235076a(15) =80333014a(16) =305030726a(17) =1162135296a(18) =4440424269a(19) =17010967118a(20) =65320831670a(21) =251350805303a(22) =969033651846
External references
- oeis: A150033