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, 1), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
A149016
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, 1), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =9a(4) =35a(5) =124a(6) =505a(7) =1986a(8) =8332a(9) =34590a(10) =148477a(11) =636316a(12) =2779009a(13) =12157264a(14) =53805721a(15) =238768325a(16) =1067794767a(17) =4788480698a(18) =21592411576a(19) =97615331419a(20) =443124695004
External references
- oeis: A149016