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, 1), (-1, 0, 0), (0, 1, 0), (1, -1, -1), (1, 0, 0)}.
A149911
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, 1), (-1, 0, 0), (0, 1, 0), (1, -1, -1), (1, 0, 0)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =15a(4) =45a(5) =148a(6) =507a(7) =1804a(8) =6639a(9) =25021a(10) =96028a(11) =375278a(12) =1486861a(13) =5967550a(14) =24225135a(15) =99306572a(16) =410630017a(17) =1711438826a(18) =7182427194a(19) =30337840617a(20) =128889250395a(21) =550511528467
External references
- oeis: A149911