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, 1, 1), (1, 0, -1), (1, 0, 0), (1, 1, -1)}.
A148418
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, 1, 1), (1, 0, -1), (1, 0, 0), (1, 1, -1)}.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =18a(5) =55a(6) =205a(7) =682a(8) =2716a(9) =9813a(10) =40365a(11) =152018a(12) =638659a(13) =2490436a(14) =10647216a(15) =42586598a(16) =184288275a(17) =751806906a(18) =3286398696a(19) =13626370299a(20) =60049705914a(21) =252280262853
External references
- oeis: A148418