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, 0), (0, 1, 1), (1, -1, -1)}.
A149904
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, 0), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =47a(5) =163a(6) =596a(7) =2243a(8) =8806a(9) =34773a(10) =140415a(11) =576389a(12) =2397200a(13) =10036112a(14) =42517170a(15) =181694092a(16) =781065217a(17) =3376828207a(18) =14701304614a(19) =64311598022a(20) =282420505486
External references
- oeis: A149904