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), (1, -1, 0), (1, 0, -1), (1, 1, 1)}.
A149580
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), (1, -1, 0), (1, 0, -1), (1, 1, 1)}.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =15a(4) =51a(5) =211a(6) =839a(7) =3101a(8) =13777a(9) =56029a(10) =225753a(11) =998649a(12) =4259533a(13) =17547961a(14) =79246365a(15) =341317867a(16) =1447967799a(17) =6547005707a(18) =28728690943a(19) =123265763859a(20) =562522396495
External references
- oeis: A149580