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), (1, 0, -1), (1, 1, 1)}.
A149688
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), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =17a(4) =67a(5) =271a(6) =1157a(7) =4937a(8) =21825a(9) =96389a(10) =434521a(11) =1968571a(12) =8990245a(13) =41375157a(14) =191270919a(15) =889024599a(16) =4150985027a(17) =19444544887a(18) =91454316291a(19) =431301158193
External references
- oeis: A149688