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, 0, 0), (-1, 1, 1), (0, -1, 0), (1, 0, 1), (1, 1, -1)}.
A149473
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, 0, 0), (-1, 1, 1), (0, -1, 0), (1, 0, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =13a(4) =55a(5) =219a(6) =947a(7) =4124a(8) =18509a(9) =83805a(10) =385192a(11) =1784012a(12) =8336935a(13) =39189722a(14) =185289101a(15) =880043266a(16) =4197296943a(17) =20088159938a(18) =96442832029a(19) =464273089991
External references
- oeis: A149473