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), (0, 1, 0), (0, 1, 1), (1, -1, -1)}.
A149903
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), (0, 1, 0), (0, 1, 1), (1, -1, -1)}.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =47a(5) =163a(6) =587a(7) =2197a(8) =8502a(9) =33375a(10) =133304a(11) =542650a(12) =2233956a(13) =9279163a(14) =38962506a(15) =165122173a(16) =703984127a(17) =3020900731a(18) =13051779861a(19) =56676234344a(20) =247160539208
External references
- oeis: A149903