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, 0), (0, -1, 0), (1, 1, -1), (1, 1, 1)}.
A149717
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, 0), (0, -1, 0), (1, 1, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =73a(5) =283a(6) =1213a(7) =5317a(8) =23579a(9) =105117a(10) =472819a(11) =2155691a(12) =9930367a(13) =45862131a(14) =212768211a(15) =991602657a(16) =4648095447a(17) =21872951307a(18) =103168498481a(19) =487859966969
External references
- oeis: A149717