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, 0, -1), (1, -1, 1), (1, 1, 1)}.
A149706
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, 0, -1), (1, -1, 1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =69a(5) =287a(6) =1251a(7) =5447a(8) =24355a(9) =110025a(10) =501753a(11) =2304001a(12) =10667681a(13) =49643657a(14) =232116329a(15) =1090122563a(16) =5139589835a(17) =24307439967a(18) =115304943979a(19) =548451658359
External references
- oeis: A149706